? on a chevy 350

[tihosick]

just picked up a 1975 chevy pickup has a 350 with a Q-jet carb and a turbo 350 trany. in park the truck will rev. up good. but when in gear the truck will stumble when trying to move?? i was told it could just be the timing?? also the kick down cable for the trany was not and is still not hooked up. cant find were it goes on the carb.

[tihosick]

pic of the truck. sold GP

[tihosick]

know one??

[Joe m]

hmm.. are you sure the kick down for the trans runs to the carb... send me a pic of what your talking abour. i know alot about efi 350's but not as much about carbs. but ill try to help ya out

[Joe m]

sorry took me a second to figure out what you were describing. alright the kickdown will attach to the BOTTOM of the throttle linkage. its kinda tricky you wanna make sure when your WOT on the pedal that the kick down will be pulled right on the throttle linkage. if the cable was already there then you shouldnt have to worry about the alignment of the kickdown cable. let me know if ya need more help.

[bronzemist02]

It could be timing and/or carb related. Check out this link. I know it is not an article that pertains to GM products, but I think it may help you out.

WikiAnswers - What is wrong with a 1991 Dodge Dakota that shakes when put into gear or slowing down and stalls when you come to a stop

[Joe m]

my 91 chevy 350 had a similar problem once. under idle it would run fine. once i gave it some gas it would fall on its face flat. fuel filter was junk. just anether thing to look at if the kickdown cable doesnt help when you get it hooked up.

[tihosick]

i wil try this stuff. but yeah when it is at a idle it runs fine.. and will go WOT with no problem.. and runs fine in drive at a idle.. but when you try to move it falls on it face.

[Joe m]

so wait in neutral at WOT its fine? but once you try to drive it face plants? check fuel filter like i said. mine did similar thing. and i dunno much about carbs likei said but maybe not having the kick back installed its not allowing it to get what it needs to roll? or the cables on the throttle now are just backwards.

[bronzemist02]

As I said, it could be the carb adjustments. As stated in the link I posted it could also be a vacuum pressure issue that would only be apparent when the vehicle is shifted out of park with the brake applied. Also, check the butterfly on the carb to make sure that it is moving open and closed properly. It might not be moving properly which is causing it to stay closed longer than normal or is opening too slowly. A flat screwdriver should be able to free the butterfly if it is stuck any. Even if the butterfly isn't a problem it is one less thing to worry about for the time being.

[Deimos]

Q jet carbs have a filter in the carb. I would get an edlebrock intake and get me a nice holley carb. You should do a tune up then check timing. I run a 12 intial and 32-36 advance.

[bronzemist02]

^I heard about the filters in those carbs before, but didn't think of it at the time. Good point.

[04intimidatorSS]

I rebuilt Q-jets night and day thats an easy fix you need to rebuild the carb, new filter and it'll run fine, my weak 350 would scream once the carb's tuned. There's a lot of adjustments that all need to be doen at the same time, a lot of people don't know how to properly tune a q-jet and the q-jet will flow more than a holley will stock.

[04intimidatorSS]

PS also my kick down cable went on the gas pedal on the 73 chevelle.... so double check to make sure its on the carb because it may go on the pedal.

[tihosick]

so yeah i changed the filter in the carb.. its runing beter.. but not as well as i thiank it should.. so i am going to look into redoing the carb.. was told that the Q-jet is a good carb if running good.. but this is the first older car i have had.. and i am 24 and the truck is older than i am....and thanks to all that post i know its not a GP but the people on here are good with motors and arent assholes (for the most part)

[04intimidatorSS]

If you lived in saint louis id tune it for you, you need to adjust the idle fuel screws, run them all the way in then back them out 2 turns, lower your idle screw till it almost dies, then back each screw out evenly by 1/8th turns and your idle will slowly come up. Keep doing this (with a tachometer hooked up) until it does not raise anymore. Then you will have a perfect idle setting. Then adjust your idle speed to 500rpm in park/neutral, 400 in drive i believe. any small block chevy should not need to idle more than 500 in drive/neutral unless it has a cam or has been heavily modified. Try that for starters, you shouldn't need to mess with the top butterflies spring tension just yet, but ill be happy to explain if need be. Also if your choke on the carb has not opened all the way the engine will sputter so that could be causing your lagging problems. Even my chevelle does that until it reaches full temperature of 160*. you need the top butterflies of the primary to be straight up and down open and firm with little play when the trucks at running tempiture. Hope this helps, and yes I am only 19 but I was raised on small block chevy's since I was 14. I love my q-jet and will never change it.

[Deimos]

04 I like the Q jet for fuel economy and performance, but I don't care about fuek economy for my small blocks thus the love for Holley. A Q jet won't flow more it just is a spread bore carb which means it has different attributes.

[04intimidatorSS]

04 I like the Q jet for fuel economy and performance, but I don't care about fuek economy for my small blocks thus the love for Holley. A Q jet won't flow more it just is a spread bore carb which means it has different attributes.

Im sorry I should have worded it better, I meant flow as in stock all q-jets are 750cfm and some are 850 (rare). Idk why people drop down to a 650 holley, when stock was 750 and they made crazy horsepower with them.

[Deimos]

Personally I'm a fan of the 1050 lol. I want to know how this goes with the SBC man...

[04intimidatorSS]

and a 1050 is a good choice lol!