Car wont rev..

**firehawkchick55** · 12-10-2009

My '99 gtp will not rev past 2500rpms. It jerks, bucks, goes up and down during driving. There is no power. With very little throttle driving is okay. The car idles perfectly. When trying to rev the car the motor shakes and sounds like the supercharger is falling apart.

The car through a po300 code (multiple cylinders misfire).

The fuel presser is 42 at idle and goes up while accelerating. I switched the coil packs and ignition module and the car still runs the same.

Any other ideas?

**a98gtp4u** · 12-10-2009

plugs and wires, clogged cat converter, injectors, no compression, computer, could be many things.

**firehawkchick55** · 12-10-2009

im gonna do plugs and wires tomorrow and im also gonna get a compression tester.

i really hope it is NOT the computer..

**a98gtp4u** · 12-10-2009

well u can find 1 cheap anyway. start cheap and work ur way up.

**firehawkchick55** · 12-10-2009

what makes you think its the computer? jw

i just bought this car for a daily driver less than a year ago and i dont know much about them. are they known for the computers going out?

**a98gtp4u** · 12-10-2009

not really, but u never know. ive seen cars with messed up computers and they barley run.

**firehawkchick55** · 12-10-2009

okay..thanks! if you think of anything else PLEASE let me know! i have to have this car fixed by sunday if i can!

**a98gtp4u** · 12-10-2009

i know how u feel. my car messed up 2day. oil everywhere. gettin it fixed this weekend 2.

**firehawkchick55** · 12-10-2009

my cars been down since tuesday and i live in chicago and the first snow storm hit tues and wednesday so there is no way i can drive my trans am so im stuck at home until its fixed

**JoelW98GTP** · 12-10-2009

Originally Posted by firehawkchick55

My '99 gtp will not rev past 2500rpms. It jerks, bucks, goes up and down during driving. There is no power. With very little throttle driving is okay. The car idles perfectly. When trying to rev the car the motor shakes and sounds like the supercharger is falling apart.

The car through a po300 code (multiple cylinders misfire).

The fuel presser is 42 at idle and goes up while accelerating. I switched the coil packs and ignition module and the car still runs the same.

Any other ideas?

Might be a completely shot intake gasket or head gasket. How does your engine oil and coolant look? Did you just get it, or have had if for a while? I bought my GTP with a miss. Oil in the coolant. Bet a friend. He said intake gasket. I said head gasket. $500 bet FTW! lol

**firehawkchick55** · 12-10-2009

the car ran perfect the night before this happened. i shut the car off like i normally do and the next day this is what i woke up to.

i just changed the oil yesterday and it was fine. the coolant is fine and there is no oil in it.

i've had the car since april or may i think im not exactly sure it could've been june lol

**a98gtp4u** · 12-10-2009

new intake gaskets a month ago. car is not overheating so it cant be the head gaskets, no coolant in the oil and vise versa. i was told it could be a front main seal, oil pan gasket, timing cover gasket.

**firehawkchick55** · 12-10-2009

a car does not have to over heat in order for it to be a head gasket...some cars even run cool when it has a blown head gasket

**a98gtp4u** · 12-10-2009

but it runs perfect. just oil all underneath the car. ifit was a head gasket it be all under the hood on the motor.

**firehawkchick55** · 12-10-2009

true..do a compression test and make sure though..

**a98gtp4u** · 12-10-2009

oh car is still running strong and gr8, no issues but the oil leak. blown head gasket, it b running like crap, throwing misfires cause of bad compression.

**firehawkchick55** · 12-10-2009

i wonder if mines the headgasket..

oh i just thought of something...

do you think it could be bad fuel? i just filled up the night before all this happened?