Eskine

ok when im driven when the car is warmed up going about 30-35 in 4th gear between 1500-2000 rpms i think, when i barely hitten the gas to stay at the speed limit the car will fill like it is missing bad but i got new plugs and wires on the car. BUT i think i need a IAC because when the car warms up they rpms will go up and down between 1k to like below 500rpms which is weird to me.

Dan04COBRA

That sounds like your running at too low of an rpm for 4th gear.

Eskine

it cant cause it will do it in 3rd only when i barly hit the gas when the car is warm and it is a 96gt

Phirantes

hehe sounds like the thread i just put up... i'm having the same problem dude, and i know that it's not bogging down the engine, it's just easy to feel when the rpms are that low and you step on it....the loss of power sucks... theres a couple of things i'm gonna try like running some 93 gas and look at getting the MAF replaced if you wanna read some past threads on the problem , go search for "fuel filter" and you'll get a whole bunch of threads that have had the same problem

Chopper

Check for a vacuum leak.93 octane gas will do nothing for you.Using a higher than recomended octane can cause a buildup of deposits in the combustion chamber.Look at the IAC also.

Eskine

i changed the fuel filter, and it is getten worse, and i cleaned the IAC but it didnt help with anything but i have a check engine light for that canister code bull **** i tryed fixing that, but no luck, and this blows GOD DAMIT [:@]and i need to change an O2 senor but i dont think that has nothin to do with it

jdaniel

Check the MAM... it will give you similar troubles if its wet ot got a bare or loose wire.

silverbullittgt2001

my car did the same exact thing and i tried all the same stuff and i replaced the throttle positioning sensor, still same problem so i bought a fuel pressure gauge and tested it , had to replace the fuel pump fixed it right up not hard to do either
hope this helps

jdaniel

Yeah, someone on here not to long ago posted that the fuel pump fixed the same problem.

stonemonk9

I had almost the same problem, but my car had overheated and spued coolant into the plugs and it was causing a short