After about 6 months of sitting (no Stabil) my car was hard to start and is running rough. I thought I may have had a flooding issue, turns out no, but here's what I would check
fuel pressure regulator - check this and the pressure before and after. I am not sure what the fail mode of these is, but if it closed up, it could increase injector pressures as it is downstream of these. Normally, excess fuel would be routed back to the tank.
I would think the mass air flow sensor either works or doesn't as it is mechanical. However, their is always the possiblity that the air flapper (flow sensor) is gunked up and stuck in a high load position. However, your car would probably not want to idle at the prescribed rpm
You can see it if you remove the top of the air box and look down into the intake.
Wouldn't hurt to check all your vacuum hoses while your in there.