Before I purchased the car, I had the luxury of test driving it for two weeks. In that time it only acted up once, but when I had it checked out, no codes were found.

Now three months later, it's the Devil's child (car). Tonight for a bit, it drove great. Went to dinner came out an hour later, it starts all over again!

I'll only get a CE light if I force the car. That is, when it hesitates and wants to bog, I keep my foot on the gas. Not always, but sometimes I will get a flashing CE light, then it will stay steady. I've read the codes and got a P170, P300 & 301. It seems to rotate among them. And after I drive it a bit, the light will go out. (shouldn't it stay on until it is reset??)

The hesitation only occurs when the accelerator is about 1/2 to 2/3 the way down and over 2k rpm's. And you can tell when the supercharger shuts down.

When I changed out the MAS, I soon thereafter changed out the O2 sensor. Again that made no differance. The MAS is the correct one (New Bosch & #'s match per MB). And the only thing the new MAS got me was better starting and idling. Other than that, it is acting up the same, just more often.

My MB mechanic (private small shop) says MB (the dealer) has a nifty computer that you can hook up that tells you everything going on as you drive the car. I may have to surcome to the Dealer . My mechanic is doing some reserch as to other possible solutions since the computer he uses says everything is running correctly (and will note when the supercharger shuts down).

Any other advice about the oil in the MAS and other suggestions always appreciated.
Shawn