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Have all the basics been covered? I had identical symptoms in an early 944, turned out to be bad dist. cap and rotor. Microscopic(almost) carbon tracking on rotor and on one side of inner cap, wouldn't exhibit symptoms until warm and under load, very intermittent. New cap and rotor fixed it completely. Just a thought. I wasted a lot of time and resources checking other things until this was discoverd. Good luck,
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83 SC Coupe
58 Speedster
Previously
76 914
84 944
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