Hello,

I also have an '99 ML320 has the same problem. I've replaced Cam, Crank, Spark Plugs, 3 news Coils on supposedly bad cylinders. All parts name brand are Bosch. I've also swapped spark plug wires around and still have the same problem. I've also cleaned Trans Connector, and other connectors. The codes i have are P0300, P0301, P0302, and P0303. Basically i am having problem on the pessanger's side bank. Things i have not done are clean out are throtle as it is not easy to reach. I have not clean or attempt to change/check MAF.

Any advice is greatly appreciated.

Alex