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Ok... Update for anyone who cares:
Misfire is still occuring, but MUCH less often, and it's now up in the 2-2.5krpm region only under increasing load conditions (any time you begin to accelerate). Interesting point is now it only throws a code on cylinder 5, which is an improvement from both 5 and 6. I also am pretty sure I heard a detonation one time at high load going up a hill. This all seems to be evidence of an injector/clogging issue, though it's more of a PITA to get at the injectors than the spark plugs believe it or not. Friggin sound deadening plates...
Anyway, I'm going to run another tankful of new gas with injector cleaner through it and see if that resolves the issue. If that doesn't work, maybe get an injector tester? If it is working electronically, Idk how to deal with a clogged injector yet. Might be a replace kind of deal?
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