Had a check engine light on and took it to the dealer (2 days ago) and the issue was a bad mass air flow meter/sensor. Had the MAF replaced and ever since this visit to the dealer(to the very day) when the ML is shifting from 1st to 2nd we get a dead spot or hesitation in engine power and have had the same problem with accelerating from a dead stop before the upshift. There have been times when the ML shifted and this event was slight or really pronounced to the point the car almost stops because of no power produced by the motor even with increased throttle input.

During this hesitation there have been no engine lights and the dealer could pull no codes. At this point I have no idea whether it is a engine managment or transmission problem.

Lastly, this is an intermittent problem that does not occur with every standing start or upshift.

Any input would be greatly appreciated,

-Kevin

Using the search engine for this site I found out the MAF part number should start with a 113 for the V8 engines the one the dealer installed starts with a 112 which is for the V6. I can't wait to call them in the morning.

-Kevin