its a 93cx... with a 98 b18c1... car runs fine.. just sometimes ( most times) while stopped it revs from 1000 rpms to like 2500 rpms by its self.. dunno know what it could be! what do u guys suggest?

 

iacv or ficv most likely

if it almost always occouring it may be a vacc. leak but if not always prolly not

 

same EXACT thing happaned to me. check where your throttle cable meets up with your throttle body. look at that little rubber boot covering your throttle cable right befor it enters the throttle body. Is it loose? does it move aroung eaisly? Mine was liike that. All i did was move that boot up a little (away from the throttle body) and force it to go over one of the thicker parts of the throttle cable so it doesnt move back and forth. What happens is i think that rubber boot get caught in the throttle body (the part that pulls your cable) and when it gets stuck it doesnt let your throttle cable fully retract into its resting state causing your rpm to rise whatever level. try that. iif its the same problem it should work.