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ECU questions 200 1983

What all does the ecu control? My car has been stalling totally intermittently and also sometimes goes into this weird surging sequence while idling. Also, every once in a while, the turn signal will blink really fast, not like normal and my temp gauge doesn't move off cold. So, my question is, how much of this could be influenced by a bad ecu. All these problems sort of happened at the same time so I am wondering if they are connected and the ECU seems like a culprit. The wire harness has been replaced and I don't think its an electrical short. So what do you think? ECU? Could the ecu cause all of this? Thanks.






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