Okay I guess no one has anymore suggestions for me. I have searched all the threads and have tried everything everyone else suggested for their problem. These are the new symptoms that we found out. We can let the car run with the hood closed and then after about 5-15 minutes the car will shut out once temperature goes above 80. We open the hood remove the OVP relay (this is the 2nd one I've installed brand new from Mercedes) and keep it out for 2 minutes and then replace it and the car starts right up. We close the hood let the car run for 5 minutes it shuts out again and then we remove the OVP for a few minutes and replace it and it starts up. Could the ECU be bad and we need to replace that? what does the ECU do? I do noticed that when my brother shakes the the wires and the "bed" that the OVP sits in the Antilock light comes on and the 02 Sensor light comes on. We also found that there was no spark going in the cap, but there is spark coming out. I took the coil to autozone and they tested it and it is fine. That leaves the CPS, but I had one of those replaced on my jeep and when that went it just went. My brother seems to think it is with the ECU - maybe the wires are bad where the OVP is or maybe they are exposed and heating up? I do know that when I replaced the OVP the first time the car ran perfectly fine for 1 week, but was having surging issues. Help!!!