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No start when hot is usually a indication of a HPOP system leaking, (HPOP, stand pipes, dummy plugs, STC). You'll need to do a air leak test to pin point the location.
If you have a monitor, you can also confirm a HPOP system leak by checking the ICP pressure when cranking the warmed up motor.
A 6.0 shouldn't run rough, should run very smooth if the motor is heathy. Do you have a monitor to check FICMv, pull codes, Fuel psi, ICP, IPR, EBP, EGR? A rough running 6.0 is a indication of a issue (bad or dirty sensor/actuator, wire or plug damage, blocked hose/tube).
"Rich is really good with knobs, his soft touch and attention to detail are like no other."-Portcity_gt
2004 F350 CC DRW King Ranch
X-3 tunes by DJ'S,QT,GH,ID. Gryphon FICM tunes, ARP studs,Stage 1turbo,ATS coolant recirc lines,Swamp's 48v ficm,coolant filter,AD2,Snow Perf stage II,EGR delete,4" turbo back straight pipe,S&Bintake,Quad "A" pillar autometer gauges,Suncoast Tri Disk Conv.,Billet input shaft,Suncoast superduty rebuild kit,Trans-go shift kit,Mag-Hytec trans pan,CFM+ elbow,ccv mod,15K reese 5er,17" LCD TV/DVD,Cobra 29 Nitewatch CB