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1994 968 rich runnig and fouling plug

Fuel System

Vehicle Information: Model(924/944/968): 968; Year: 1994; Body Type: Coupe; Total Mileage: 140000;

We replaced the lifters, did not remove the head. The car starts fine and will take smooth, light throttle up to 2500rpm. Over 2500rpm or on snap throttle the engine immediately runs rough as it fouls number 4 spark plug. We have checked everything we can think of to no avail.

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