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I've heard from several teachers/mechanics that the Techron is the only fuel cleaner to use for fuel, GM(?) top end cleaner for gummy cylinders, and Rislone for sticking lifters. Changing oil soon after is a good idea after anything.
The fact the top end is strong indicates good fuel flow, but there may be a piece of crap in the tank that's being sucked up at idle (not likely).
I'd guess a bad head temp sensor or airflow sensor that's making if run super rich all the time. Second guess is a stuck distributor advance.
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Meanwhile other things are still happening.
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