I finished installing an EGR delete on my '03 F250 yesterday. When I went to fire the truck up, it would just crank and crank. Finally got it to start, and let it idle for 10 minutes. Idle was rough, and was slow to build RPM's when pressing the throttle. The standard diesel injector knock sound seemed louder than before. I shut it off, and tryed to restart with no luck. This morning I got it started again after charging the batteries. I let it run for 45 minutes this time hoping it would straighten up. It kept running rough with now power and slow to build RPM's. Shut it off and no restart again. It is acting like it is running out of fuel, but the tank is full and it was running fine when I pulled it in the shop. I finally have gotten it to start when cranked, but if you try to apply throttle it has no power. When you pull it into gear, it dies. I talked to the Ford Tech that works on all of my work powerstrokes, and he believes it is the engine wiring harness. He claims the '03 and early '04 harnesses are almost too fragile to work around. Any help will be greatly apreciated. The truck is stock except for a straight pipe. The only problem with the truck before was low power when cold. Intake was carboned up pretty bad.