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1985-1986 Idle hunting

Engine

Vehicle Information: Year: 1985; Engine (size, modifications): 4.7; Total Mileage: 140k; Transmission type: Autotomatic;

I have a recently returned to life 85 928s it runs ok apart from things falling off, stopping, breaking, etc everything you would expect from a twenty one year old car it is an auto my first, finding a manual 928 is like winning lotto. The problem is on standing at traffic lights in drive foot on the brake pedal the motor begins to hunt, it sits there going rev rev rev and when you take your foot off the brake it moves forward in the same fashion it also stalls occasionally its got to the stage when waiting I pop it into neutral even for a couple of seconds.

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