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Old 05-31-2012, 09:41 PM   #3
thstone
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Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
The ECU is programmed to compensate for the load of the a/c compressor at idle by increasing the air/fuel flow so the idle remains relatively constant. It sounds like that function is not working properly. I'd look at the MAF or the idle control valve.

A partially clogged fuel filter would typically work ok at idle (very low fuel flow rate) but not flow enough fuel at high speeds and you'd get lethargic acceleration and poor performance at high throttle openings.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
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Last edited by thstone; 05-31-2012 at 09:43 PM.
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