1988GTstang

ok ive replaced the IAC the tps ive had the timing reset the wires/cap/rotor/fuel filter/plugs done...found no vacuum leaks wut so ever...wut else can cause this? it starts surging 500 rpms once it warms up..if u turn the car off and restart it it will idle normally again until u drive and come to another stop...really gettin annoying

Joel5.0

DIY KOEO/KOER self tests procedure and Base Idle reset procedure. LUK

kremer306

mine did the same thing till i jacked with the fuel pressure and the advanced the timing

mjr46

do as joel states, if that yields no results, look for a vaccum leak, lean or rich conditions can cause idle surge