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My 86 944NA daily driver starts and runs great in spring summer and fall but when winter come starts a bit hard and runs rough and rich for a few minutes and then runs fine when warmed up. I have changed and tested everything except the speed sensors. I have found that the DME isn't sending the proper signal to the idle control valve when cold. It always tells it to be closed and it needs to open up on a cold start in cold waether for sure. any thoughts?
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