Double check the MAF. Disconnect it and see if the problem persists. If so, then the MAF is ok. If the problem goes away, replace the MAF again.
Check for air leaks (including dirty throttle body which does not fully close/seal and creates a small air leak).
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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