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      05-17-2012, 07:29 PM   #10
e90pilot
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Drives: E90 325i
Join Date: Jul 2005
Location: Oakland, CA

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Another experiment. Let it idle in neutral and with your window down, give the throttle a really sharp stab to rev it a bit. Do you hear a "gasp" from the engine? If you're in a manual car, slow the car down in second gear and but the clutch in at about 1200rpm. Do the revs come up before they go down?

My car does this once every few months randomly. My guess is that some non-critical sensor isn't being read. And it goes away on the next start.
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