Hey guys so I'm in need of some help. I have this problem with my Evo 8, here's what happens, when I first start up the car the idle would jump up all the way around to 2500 like i can hear it gradually raising, then drop its way down to normal 900. Warm start. Then today it got worse, when I drove the car and rev it to 4 grand in boost after decel the car would keep its idle at 2grand for a second then it would jump to 1.5-2.5 Rpms and continuesly jumping back and forth.

I checked for loose vacum but nothing. Could it be the idle air controll? Or the maf? Please let me know what you guys think, i will try to post video. Thanks

Also the while driving if i let off the gas it will give it gas itself and hold it there, unless i put it into nuetral, where then it does the jumpy idle..

 

ah I had the same issue, my tuner sorted that out for me.

 

Do you know what it was? Ant help is apprciated

 

Anyone have this issue?

 

Same issue here no fix yet.

 

Check for vacuum leaks also throttle body seals can cause this issue

 

I looked for it and it does not change anything. Im gaussing its the maf i have one comming in thursday