Question about 1988 Jaguar XJ6

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1988 jag xj6. at idle the rpms go up and down. engine does not settle at one speed at idle. with the car in drive and brakes holding car in place the rpms are at 1200-1300 but are at a constant speed. no raising or lowering in rpm. is the probelm the idle conrol valve?

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I would think either the throttle positioning sensor or a vacuum leak

Posted on Jan 01, 2009

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