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keep throwing misfire code! HELP!!

9

98GTPPACE

New member
I've been having this reoccurring problem with misfiring under wot and under boost even if not under full throttle. I changed the spark plugs I currently have autolite 606's with a 3.6 press on pulley. I got the car with the pulley and the previous owner said he changed the fuel lines and fuel filter. it was throwing a random multiple cylinder misfire, and just the other day was thrown cylinder 1 misfire. please help me ASAP. it is causing me nightmares lol.
 


Previous owner said new wires ad I swapped coils before and nothing changed. I changed the spark plugs just last week. The car runs fine just under heavy pressure and boost the check engine light comes on and I did the Lucas oil injector cleaner thru it
 


Idk ill have to check it out and see. And btw I tested the coils and wires for the right volts and everything is alright. I'm just so lost.
 
Well when I was driving it home the first day i got it. it came on for multiple cylinder bc I was goin 90-110 every so often and whatever thought nothing of it. I changed the plugs and they were ngk and had miles. And changed to these and this is my problem since. It's only a 3.6 press on. I have a 3' dp 3' cat a 1.0 tune intake and 180 thermostat so I don't see why it would be that bc if I went to a 3.4 with autolite 104 I would be just fine where I'm at now
 
the cel light only flashes if theres a problem. going 100 mph shouldn't make it come on.

when you say the plugs were worn, where they still whole spark plugs? not smashed or missing pieces?
 


Do you have any other troubleshoots ? Ill have to do it. But would there be anything in mind. I know it could be little things but I'm just starting and this is the worst way to. :(
 
you can take the plugs back out, make sure they are not cracked. swap the plugs around to see if the miss moves. move the wires as well, to see if the mis moves.

change the wires, who trusts what a seller says.

and make sure the wires are on right, aka right wires to the plugs.
 
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