Hi everyone! I have a gp080vx It has a gasoline only vortec 4.3 v6. The unit will start and run for two seconds then shuts off. The original problem is that the unit had sat so long with old gas. drained the gas installed new gas and still the same problem.I went into the display and cleared the codes then it ran about 30-45 seconds until codes popped up and then shuts the truck off.If anyone has a manual i would greatly appreciate it. email [url/email removed] the code popping up is a 653-6 and before i erased the code history i believe it was a 654-6,652-6,656-6. The fuel pressure is 58 psi +-5.