car shakes when idle.....

[birdii]

anytime when my car is idle the rpm drops to 500rpms then the car starts to shake.... but a few secs after it slowly goes up around 700-900rpms.... then drops to 500rpms.... can anyone tell me why this happens?

thanks

 

[1gentalonfan]

check your tps i had the same problem in my old B16 but i dont know if it carries over to dsms but try it anyway if not i think theres something called an idle sensor but im completely unsureon that and whether or not its not just het tps

 

[birdii]

would you know what the price range for that part might be?

thx

 

[Majikterror]

IAC motor. Mine did that and I unplugged it and drove around for a while and plugged it back in and it ran fine.. I know, WTF?!