when the ecm doesnt recieve codes it goes back to the defalt mode and runs everything at startup mode. that could explane why it seems to be running rich, sounds like it. it could be a bad sensor in carb, or somewhere else, being as old as it is you should be able to pick up a yard computer cheep enuf if thats the problem, but i dont think it is. i think you have a bad sensor,
which one is guys? any help here?
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