ok i was driving my car today got on it real quick just a little boost. then got off it real quick also. with me doing that it jar it self. i pulled off the road my car was rocking at idle between 2k and 2400. i checked all the hoses one what off under the intake manifold so i put it back on. thinking that was the prob. start the car up again and it still does it. it is driving me crazy. i had my friend ride with me. he plug his data logger and everything is fine. their is no CEL. oh yeah on first start up the car jumps to 3k sits their for a few secs and then goes back to rocking 2000- 24000.
can someone please help me

 

can anyone help? it is driving me crazy.

 

Make sure one of your I/C hoses didn't pop out and double check your vacuum lines again.

 

now if the lower inner cooler gasket (i have the buschur lower pipe) is bad will it make it do that? it is a rappied idle between 2000-2400. if i put it in any gear and let it drive it self. it will go to 2000 drop down to 1500 go back up 2000 ect....
would it be that leak? or would have to get my ECU rest? even though it isn't throwing a CEL. thank you all for reading and helping me out.

 

I changed that lower inner cooler gasket. still does it. can some one please help. did a boost leak test and it is good.vacuum lines are good and hooked up. no CEL still. can't for the life of me figure this out.

 

ok it finely threw a CEL: P0507: Idle Control System RPM Higher Than Expected.
i took a look at my IAC(it is the senor right under the TB) I think that's the prob.
it is melted a little. I do run meth in my car. and from looking over the forms i noticed that other people have had the same prob with that senor.while running meth. now is their a better IAC that is not plastic on the inside? from what i heard older model cars had them. can some cross reference this part for me? i don't want to have this same prob again. thanks everyone for reading.

 

buy an evo 9 one, dont they have the metal ones?

 

I've had this exact problem before. Check your connection from your wiring harness to your idle air control motor.

 

lol....very weird problem..

was just about to let u know it was ur IAC, but you figured out the problem on your own