Got car back from a dealership service- 500+ dollars for MAS. I remember posts about MAS but can someone explain what that is (one more time, please). I had hoped it was one of those throttle cleanups only- but I was ready for the most expensive item to be the cause- well the good news is so far vehicle has not stalled and the outside temperature was over 90 degrees. So if this fixes the problem well I'm all smiles...