Sorry for my ignorance but what is an "MAS"? I need to know because my 2000 X automatic has started doing this same thing intermittantly. I think it may have to do with humidity, it seems like more humid days are when the problem shows. What is happening is after the X is warmed up and I stop at a light, the idle starts fluctuating wildly from 100 to 1500 rpm and eventually stalling. But as I said it is intermittant and when I had in the dealer last it never acted up and they did nothing, so it would help if I could tell them exactly what to look for.
Thanks for any help.