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1987 924 S Rough Idle and Gas Gauge jumping


Vehicle Information: Model(924/944/968): 924S; Year: 1987; Body Type: Coupe; Total Mileage: 100000;

When I start the car occasionally it is slightly rough at idle and the gas gauge doesn't register what gas I know is in the tank. When the gauge does not jump and goes to the right gas amount the engine runs smoother. What am I dealing with here? Filter,pump,other? It also does it when it is started with the clutch in and in 1st, but in neutral and clutch in it idles smoother. Had a new tank and lines installed less than 2 years ago.

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