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1999 996 Engine Vibration at Idle

Engine

Vehicle Information: Year: 1999; Body Type: Coupe; Total Mileage: 24.502;

Engine produces vibration that shakes the seat, and makes a "humming" sound. Clutch in or out makes no difference. AC on or off makes little difference. Car has been at dealer ship since 11/13. Porsche Tech assistance (Atlanta) wants dealership to tear-down engine for more analysis.Dealer said replacement engine on way until today (12/3) they said nope, keep trying to fix the original ! Nobody seems to have a clue. Leak down,compression, air sensir- all checked. Any ideas >

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