[mitch51]

I own a 2006 Endura with a 5500 Chevrolet Duramax diesel. I had the same type of problems with mine right after buying it. i took it back where I bought it and come to find out it needs to have the fuel filter changed out every 10000 miles. After that was done I didn't have any more problems. You may have the same problem if you have a diesel.