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740 runs rough and gets poor gas mileage 700 1986

I had almost the exact same symptom, I checked everything but the O2 as I didn't know how to do it, well thats what it was.

All the other stuff said has caused others problems in the past too, so it is good advice. The fouled spark plugs are a symptom though, not the cause.
--
89, Gold 745 GL Wagon, 210k known miles. Just a beginner






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