That's pretty normal, so it may well be the A/F that's messing up. But on the grounds that the MAF is both easier and cheaper, I think I'd try that first.
Since you had a P0172 DTC, here are several other things that could cause misfires:Well what i figured would happen happened, the coil didnt alter the performance of the car. I started at cyl #1 and swapped each of the existing coils with the new Denso coil one by one. So im back to the drawing board.