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1978 911SC Rough Erratic Idle

Engine

Vehicle Information: Model: 911SC; Year: 1978; Body Type: Coupe; Total Mileage: 117,500;

Hello, My 78 Sc has an erratic rough idle. It doesnt happen all the time, but seems to be happening more often. I was checking the oil level, and the engine was running rough, and I could smell vapors, almost like it wasnt firing all cylinders. I put the oil cap back on and the idle smoothed! Could the oil cap be thge culprit?

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