Sound like like you were loosing fuel pressure somehow??

I know when you have low fuel pressure the car will and can stumble shake miss have no power , etc.......... you get the picture.... take a look under the car with a flashlight and see if you see any wet looking spots aorund the fuel tank/pump area. I have seen leaky fuel lines from the fuel pump to filter to main lines leak and cause erratic starts and stumbling under loads..


Or it could be a 100 other things but the ECU diagnostics should have picked something up if it were a sensor or malfunction in the ignition...


I know that the older Mercedes were famous for fuel pumps locking up when the car sat for long periods of time..... Dave