I'd check it with a scanner first. Not to read any trouble codes but to see what the computer sees in terms of sensor inputs. Things like coolant temp, MAF voltage, Injector pulse, etc..
I'd check to make sure that the fresh air intake hose didn't have a crack/tear in it that allowed unmetered air into the engine without passing throught the MAF.
Possible fuel pressure test.
Unfortunately, this kind of thing is so hard to fix without being there, tools in hand.
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