91 3.4 Lumina Misfiring

[comet240]

hi me again lol

i replaced plug wires and plugs, i replaced pvc valve and fuel filter last year but when it idles its fine when i gas the engine when i driving say from stop it sputters doesnt just move so car shakes to the sputters till it gets to an rpm then runs fine only at that high rpm still will run rough at 80km too but what is it timming? or what can be done is computer bad?

[comet240]

anyone have any ideas yet? i so frustrated pissing me off

[comet240]

so i tried plugs, plug wires, cleaning air miture sensor, had fuel filter replaced last year, i put fuel injector cleaner in and water seperator but car still sputtering when i floor it

so whats the problem?

[comet240]

so i still trying did some more fuel injector cleaner, and cleaned sensors but what is it why is my car still sputtering

[comet240]

i replaced plug wires and plugs, i replaced pvc valve and fuel filter last year but when it idles its fine when i gas the engine when i driving say from stop it sputters doesnt just move so car shakes to the sputters till it gets to an rpm then runs fine only at that high rpm still will run rough at 80km too but what is it timming? or what can be done is computer bad?

i tried different things cleaning the throttle body sensors and stuff, so i not sure

any help

[comet240]

i having bad week and seems worse seems like no one has an answer for this question, does anyone have any suggestions on what to do next minus burn the car LOL

[cf1]

Originally Posted by comet240

so i still trying did some more fuel injector cleaner, and cleaned sensors but what is it why is my car still sputtering

check the temp. sensor.. it tells the cp how much fuel to send.. its sending a message for a cold engine when the engine is warm ...

[richtazz]

These cars with the 3.4 DOHC are known for developing a vacuum leak around the intake manifold base, especially after the engine is warmed up. Try spraying WD-40 around the base of the intake (the seam between the intake and heads) while the car is running. If the idle changes, you found your problem.

[richtazz]

You already have another thread about this issue. Please don't start multiple threads on the same issue, as it doesn't get your question answered any faster, it just clutters up the forums.

[comet240]

well temperatue gag does go up to the past half way mark so that seems always normal

and ill try that wd-40 trick so i do that under the cover plate then i know i re cleaned the ports cuz i had oil in all my spark plug ports little bit in the 3 back but more in the 3 front but i cleaned them and stuff,

so ill try the penitrating oil trick and whats the solution for that, and i never repolaced plenium gasket ever cuz i have that lid off so many times for different repairs that i never both im pretty quick at removing it lol

[comet240]

ok i figured if i changed topic name get faster as it was a week before i got reply

but thanks i gonna try ur trick later too

[comet240]

ok i tried ur wd-40 trick didnt do anything no changes so i guess thats not the problem what next be thing to check

[comet240]

so any suggestions yet is it o2 sesnor? as other day i was driving car all day no problems it didnt sputter nothing but yetersday when it was raining it was back again so what can it be