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mid range struggle

V

venge24

New member
1997 gtp,
-deleted cat
-2 new 02 sensors
-6 new ac delco plugs OE replacment
-good fuel pressure
at first my cat plugged right solid, so i bought a new cat and new res, and a new rear 02 sensor, it ran great for about an hour and started to run rough again. seemed sort of like the cat was plugged again(but not as bad), so i cut the cat open and took out the inside of the cat.
-also checked air filter
then replaced the front o2 sensor, it worked pretty good but started to run rough again.
so now, in mid range(and mid boost)-2500-4000rpm the rpm;s seem to jump and the boost gauge seems to flutter between 3 and 4 lights while it does this.

at wot im pretty sure it works right, not too sure though as i dont really know what to compare it to
 


edit* if im parked uphill and put it in gear, every time it seems liek it misses the car rolls back ever so slightly (and only when it *misses*). this is very hard to explain
 
have you been cruising along before this happens and it happens when you roll into the throttle to gain speed?
 


im going to say it is a transmission issue and not an engine issue. these cars are notorious for torque converter problems with higher mileage.

do this, next time you think of doing it, let completely off the gas then ease back into it. if it doesnt do it then youre probably looking at some trans work. TCC lockup issues are very common.
 
yeah ive thought about tranny issues aswell, i heard about torque converters having problems, what kind of work might i be expecting? what causes the torque lock problem?
 
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