Eversince i put the P28 on my teggy, my rpm goes up and down when its warming up...but then once the car is fully warm, it does not do that anymore? have u guys experience this on ur chipped P28? Other than that...the ecu is really good...

 

what does this have to do with a vafc? sounds to me like an idle problem.. the fast idle thermal valve or FITV could need some tightening if your motor is obd1 or just clean the IACV on the back of the intake mani.

 

do you have a different manifold with that ECU. I am getting the ECU off of a friend and chipping it for my hondata. I was wondering if i need a different manifold also? Sorry to thread jack....and yes thats probably a problem with what he said. My car used to do the same thing. Then my father and i took the throttle body apart and fixed it and its fine now.