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.
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.