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engine bucking

Engine

Vehicle Information: Model: Carrera; Year: 1989; Body Type: Coupe; Engine (type, size, modifications): 3.2, chip, cat bypass, fuel meter on air flow sensor set + 2 teeth; Total Mileage: 155,000;

Have engine bucking only once engine warms up to normal operating temp. It does it when under acceleration in 1st and 2nd gear between 2500 and 3000 RPM. Once over 3000 and in upper gears will not buck. Bucking is quite violent. Car idles fine, tach does not appear to drop when car bucks.

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