[EzRush]

Just wondering if this is my CAI or something else, for some reason when I pop my car into neutral when I'm slowing down to come to a stop or going downhill my car revs to 2k and then drops to 1k then goes up again and drops again. It does this until I come to a stop and does slow down the slower I go, and when stop it idle's at a little under 1k.

 

[Scourge]

It might be your IACV (idle air control valve). They're known to stick. I just unscrewed mine from my throttle body, pulled the gasket off and cleaned it with brake cleaner. Reassembled everything, put the gasket back on and screwed it back onto the throttlebody.

Option 2 is to get one of those IACV block-off plates.

 

[EzRush]

I'll have to check that out, just seems to me that there is air getting into the engine causing it to rev higher then drop, only seems to do it if the air is cool once it warms up(outside temperature) it's not as bad.

 

[abc123]

Did you ever Fixed the problem?

cause i have the same problem, when the car sits it idle fine. But when im slowing down and putting the car in neutral it starts to rev up and down very slowly (1000-1800). when i come to a complete stop the idle goes back to normal (under 1k).

i have cleaned the IACV before... What else should i check? or should i re-clean the IACV

 

[blkintegragsr]

my car does the same thing when it was on the dyno it didnt do that i got the car home and now it does it what a pain in the ass