when i start the car up, before the engine warms up i get a surging idle like high and low, high and low, i can hear it really loud coming out of my intake, but as soon as i touch the gas its fine and when i let go it goes back to the weird idle, and as soon as the temp gauge starts going up telling me the engine is warming up it stops and idles fine.... if anyone can help me out i'd appreciate it

 

Clean or replace the fast idle valve (FITV). Click here.