Hey if you are willing to help please email me with your thoughts. I have posted numerous times about an irratic idle and all I have gotten was smart *** remarks I thought we were all here to help each other.Well here's the prob- I have a 94 ex coupe d16z6 with cold air ,a hollowed out cat,basically a straight exhaust witha tsudo pipe,chikara header and all of a sudden after my car half *** warms up it surges at idle from 1000-3000 every so often but happens less when the lights are on then my thought when the coolant fan comes on it idles steady around 1200 so what could be the problem the dealer tried to tell me that it was the IAC valve I replaced that along with the map sensor off another d16 I am building but the problem persist.The only thing is when I disconnect the throttle position sensor when running it takes the idle to 3500 and stays there so could my prob be the tps? hit me back if ya can help any thoughts appreciated. Thanks mike

 

it sounds like a vacuum leak or hoses installed incorrectly
there is a diagram on the inside of the hood, check it out.
if the hoses check out, get some carb cleaner and spray around the intake manifold, and throttle body
see if it slows the idle down.

 

I have already checked for vacum leaks with carb cleaner ..........guess what no leaks and all hoses are correct