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intermittent instability of idle 200 1990

posted by  someone claiming to be hiphopmyvolvo on  Sun May 1 15:28 CST 2005 [RELATED]

244 w/195,000 miles.
I am under the hood manually revving the B230 engine to 2000RPM, every 4-8 seconds the idle will have slight drop off of 50-75 RPM.
WaHHHHHHHHHerWaHHHHHHHHHHHerWaHHHHHHHHHHHHerWaHHHHHHHHH...
Where do I begin to check? It seems maybe all fuel injectors cuts down fuel delivery, juice to new plugs drops out or something.
I own a 1993 944 with the same motor and it doesn't do this.

Any advice appreciated,
HipHop My Volvo








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    intermittent instability of idle 200 1990

    posted by  pearl on  Mon May 2 00:53 CST 2005
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    last visit: Sun Jun 7 09:41 CST 2009
    [RELATED]

    Could it be a vacume leak in the intake system?








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      intermittent instability of idle 200 1990

      posted by  someone claiming to be hiphopmyvolvo on  Mon May 2 01:59 CST 2005 [RELATED]

      Vacuum gauge is stable thru all this







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