e46 studders at highspeed
Hey everyone, I've looked everywhere and cannot find the solution...
the last 2 weeks my car runs smoothly up until 95km/h - 115km/h and then the RPM will lag and studders around 2000, having a really hard time to get up to speed. I cannot describe it but the gas consumption meter goes up to 20L/100 but the tachometer struggles to go pass 2000... After about 10-15secs of lagging, it revs up normally.
The best i can describe it is, its like shifting gears from 1-2-3-5, it misses 4th gear... but this is an automatic... The problem goes away if its in steptronic. (RPM revs up normally no lugging along at that speed)
I originally thought spark plugs will fix the problem but it didnt... sooo any suggestions?
2000 328i, 159000km, always synthetic and 91Octane gas. No mods to engine.