Thanks guys. Local dealer wants $460 for the MAF, but I think I can get a used one for cheap, at least for diagnostic purposes.

If it doesn't work out, I do have another car, so I'll probably just order online and wait.

I took the morning off tomorrow, so first thing I will do is try cleaning it and see what happens.

I think the over-revving may have been a misunderstanding. The engine never revs past what I input through the gas pedal.