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Engine would start, idle ok, then slowly misfire more and more until finally stalling. Upon restarts misfires began immediately. The only way to keep engine running was to continually feather the throttle.
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I had this one morning with my e36. I went through a whole diag ordeal and panicked that the engine was shot. But all it was, was the circular plug for the ignition wire harness wasn't totally plugged in. It was half way in. It ran fine sometimes, I even drove it for 45 minutes the night before, and the next day it starts misfiring like that and would come and go.
I discovered it would change as I hit the valve cover, and that the harness was just moving slightly. Looked at that screwed the plug in properly and it's good. I doubt it but maybe that's all it is, check electrical connectors.