Saturday I picked up a 2007 F4 with 186 miles on it in Houston. I test drove it and everything was fine. Got it back to Dallas, drove it off the trailer in to the shop where it died. The dealer had sent me on a test drive with almost no gas. Battery is brand new, but no telling how old the gas was. Now it won't start. Fuel pump works fine, and it will start if using starter fluid. I'm thinking clogged fuel filter or injectors. Any ideas?