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turn the car on then run around and see where it's leaking.
When i did my head gasket i didn't get the fuel pulsation damper on there good enough and it leaked enough that it threw the mix WAY off and it was missing and sputtering. I tightened it and still leaked, so what i did was use an O ring as a washer between the fuel rail and the banjo fitting or whatever that thing is called.
So really any leak will cause that, and that most likely is your problem.
EDIT: although probably not the pulsation damper like me, probably the injector seal like you said, or cold start injector.
There is a way to test the air flow meter using an electrical tester or something, and you measure the resistance between two wires when the afm flap is all the way open, and when it's closed.
And by hung over, do you mean drunk? Lol
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