maf sensor wanted

I've just done the coil on plug conversion and the car ran better than ever for 200 miles. Then started to misfire around 2.5k rpm. Idle is fine, if ya can battle with the revs past 3k rpm then it will rev quite smooth. But being an auto, setting off is akmosy impossible without a race launch. Done a boost leak test, found a pipe off. Sorted that. Still runs the same. U plugged the maf and apart from a bad idle, runs sweet.
So, anyone selling a known good maf. Pre face lift auto.
Or is it best to just get a new 1?
Cheers
Danny

Got couple here come over and try if that's the issue.

Got 1 sorted thanks to Adam. Cured the problem and we're back to happy legnum motoring.
Thanks Adam.