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If the crank sensors are old or if you don't know when or if they were replaced, just do them and the O2 sensor "while you are in there" because they don't last forever.
Can you hear the fuel pump run for a second after you turn the key? If not that can be your issue. The DME relay usually fails with some warning and while running will start to run bad.
The crank sensors are something to replace even if they test out OK. My last set of sensors would OHM out just fine, but evidently failed when they were hot. Replacing them cured my 85 running issues.
Good luck with the hunt for a fix. I love my 85 911, and I drive it a lot. After 174,000 miles it runs like a Porsche is supposed to. I will keep driving it to other states until I hit all of the lower 48 in the continent. Just 8 states to go for my 911.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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