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930 turbo stumbles under load

  1. 2

    1983 930 turbo with high idle rpm also misfire or stumbles on acceleration under load but not in neutral. Most likely cause?

    Just finished replacing brake booster and master cylinder and brake bleeding. Went out for drive. Brakes work fine but the engine has developed a stumble or hesitation on acceleration. Sometimes at 2200 rpm at other times 3500-4000 and will not get near 5000 rpm. All this happens under load 1st...