Looks like i've sorted out the idleing problem by replacing the idle air control valve.But now the revs still sometimes stay sky high when i engage the clutch.Also when changing gear the revs don't come down like it's supposed to.Has anyone ever experienced this before?

 

my idle drops down to 200-300 & car tries to stop. Will i be able to fix this by cleaning the Idle control valve???

 

i got the same problem, im trying to figure it out

 

I've finally found the problem,after replacing the iacv.The screws that hold the butterfly were a little loose,so the butterfly couldn't be centered.Just tightened them and it's sharp.

 

seems like lot of evos have this issue..

 

Yes definitely.The guy at the parts desk told me that even the Triton bakkies(pick up) have the same problem.

 

what does any of that mean? and im still trying to figure out how to fix this

 

Mine does this too, I think that this actually if pretty common.

 

Do you still need help with this?

 

unfortunately, yes. What is this "butterfly" you speak of on the IAC valve? do you have pics? or a how to?

 

I just had the same problem and got a used iac put in then idle stopped jumping around but was a little high, so my tech adjusted the tps while checking evoscan down to 12% and biss screw and its perfect now

 

I have your same problem, Evo 8.. Did you solve it?