The o2 sensors were services about 20,000 miles ago....So far the dealership as I said had it two weeks. Coil. Replaced the aftermarket one the independent just installed. The 2nd independent had it 1 week. Couldn't diagnose it. The first independent had it 4 weeks, replaced the crank sensor, temp sensor, both coils...see above..wires, rotors, cap but only one. The other one looks cracked to me though but Mercedes Benz of Sarasota did not identify the cracked second one so Im not sure it's an issue. I'm thinking that some of the motor heads here would have some input on the subject. (Steve). By the way the injectors seem to be fine, no spitting just the chugging loss of power under acceleration (worse when a/c is on until the speed is reached. Then its smooth as a kitten purr. Idles perfectly. One new fuel pump, the other one is original but the rail pressure seems fine ( I think. )

HELP