when im driving it its fine but when i throw it in neutral comin up to a stoplight or something it revs up and down from 2k back down to 1 anyone know whats causing this?

 

air intake temp sensor??

 

FITV. Just search through tech talk for the 1 million posts about idle problems. Or for $20 I will come to you and fix it.

 

thats either a throttle position sensor or a Idle air control valve the intake air temprature dont got nothing to do with that

 

its your TPS sensor, the sensor monitors what location the throttle is in and if that sensor goes out or is just missing or not hooked up the ecu doesnt know how to compensate the injectors for the throttle change so it just causes the idle to go up and down. when you take off it will be fine or at least seem like it when actuality you are burning alot more fuel than you think and which will actually cause you to lose horsepower. ever notice how your tank seems to empty alot faster?

 

TPS does not cause a bouncy idle It is most likely the FITV.

 

i would say IAC

 

FITV ! thats the problem I had with my h23. but It wouldnt hurt to clean out your IAC valve either

http://www.g2ic.com/forums/showthrea...threadid=44386

theres the write up for the FITV

 

I've also posted the link to how to fix your fitv in about 10 other idle problem threads.

 

OK its more than likely airpockets, a leak, or not enough coolant in your coolant system. You should pressure test ur coolant system if its not holding pressure it wont open the IAC(idle air control) valve and it will idle like that i went through this and make sure ur idle is set right