I had an Apexi PFC fitted and mapped a few weeks ago to my MY99 rb5, the car has been running great since then with only one minor problem, it has started to idle at very low revs, about 250 rpm.
This always happens when i take my foot off the throttle, it drops right down, almost like it's going to stall. It will run at very low revs for about 10 sec then slowly increases.
Is there any quick fix I can do myself to adjust this? Or will I have to return to the mapper?
Cheers!
Martyn