A brief update on the progress. I decided to replace the other coils and the car ran perfect. Idled great and accelerated smoothly. I took it on a couple of short trips (less then 5 miles) and all was well. I took a trip about 30 miles and still noticed everything was fine. When I went to start it again the idle had the same poor quality as before and the acceleration was poor.

Only codes I got were: Low voltage at ECU, 8v at ECU, and ICM faulty. I spoke to a MB mechanic and they suggested swapping the OVP just to be safe. The old one had something loose inside and I put in the new one. The car is still just as bad. Now it barely stays running unless it is warmed up or you keep your foot on the gas.

Only thing I can think of being left is ICM, voltage regulator, and ECU.