HELP 2005 F450 6.0 no start!! I've been a nation reader for some time, first time posting. Replaced turbo back in April. Truck was running great. Truck sat until July. Truck fired right up , ran great several days of all day use. Next day truck would repeatedly start and die. Had to feather accelerator to keep it running, no problem above 1000 RPM; below 1000, like shutting key off. Now attempt to start and starts normally for a split second and dies. Attempts to run but rarely will by feathering accelerator. All pid values seem to be in order. We have ck/cmp sync,ficm/PCM sync, pass injector buzz, all ficm volts good,55 psi fuel, 1.5 seconds crank yield 1800 psi high pressure icp hole, does not bleed down. Plenty cranking rpm. No obvious causes for no start. No codes except ck/cmp due to start/die cycles. Any help would be greatly appreciated!!!!