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1984 Porsche 911 loses power

My engine is losing power and when I took the oil filler cap off the engine stalled out. I did it twice with the same result. What could my problem be?

I hope you find someone here that knows. You might post this on a 911 forum.

My top of the head guess would be the PCV system.

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Seems to be a common enough problem on these cars, according to various forums. Caused if a restrictor for the oil tank breather hose is missing. Or there’s a worse vaccum leak than is caused just by removing the oil cap.

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