I had a bad throttle position sensor which had crazy stuff going on when driving, random rpm drop and surge.
Definitely make sure its not a vacuum leak. Intake boots, fuel injector air hoses, random vacuum lines, brake booster line, PCV hose, etc. Spray brake cleaner on each one individually, if the idle goes crazy you found the culprit. __________________ ~Dave~
98 328ti Morea Grun slicktop
11 128i space gray slicktop
13 JGC WK2 Deep Cherry
Search | RealOEM |