I took the truck to a mechanic and he hooked it up to a diagnostics and it is showing no codes. He ran a fuel pressure test and after that it seemed to run fine. Once I left the shop, it seemed like it was not getting any fuel. My truck stalled, I started it back up and it ran fine for a few miles then it started again. I also changed the spark plugs. Do you think I could have something in the gas that is causing the injectors to clog temporarily? When I restart the truck could the pressure from the fuel pump clear the injector? What do you suggest?