MAF problems can be tough to diagnose too, often don't set a code. The ECM just gets a wrong reading, and calls for the wrong fuel (way too lean if it's not reading the air flow) and the engine will just stall or detonate unexplainably when you crack the throttle and the engine gets more air not seen by the MAF.
I'll wager 37 cents the MAF is either in backwards or a wiring problem to the MAF.
I would try unplugging it with the key off, then restart, and see if it will idle stable with the MAF unplugged.
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