Airflow sensor

I just recently had my motor completly rebuilt on my 95 GSX. This is the first week i have had it had been driving like a dream. today i ran into a problem though- Its idle is only at 500-rpms. when driving it for a bit and i shift into neutral it kills. the engine light came on so i took it back to them and they plugged a computer into it and it said it was an airflow sensor. Does this sound right? and also does any one know of where i could get one?

i got one forsale right now... pm me

When doing something major like rebuilding a motor, I think it would be an odd coincidence that the MAS would croak soon after. ;) I dont have any better suggestions though, except to make sure they plugged it in well enough.