2004 F350 6.0l Automatic
It has done this for sometime now, and only between 45 - 75 MPH in the 1800 RPM range when in overdrive and I ease into maybe 5-25% throttle.
Idles fine but has an occasional miss/detonation to it.
When I run WOT the truck acts like it hits a fuel cut in the high RPM range almost if it isn't getting enough fuel or oil to the injectors.
I have not replaced the FPR Spring HPOP ICP Sensor or IPR Valve. It has remanned injectors but throws Cylinder #5 and #8 codes if I remember from the last time I checked.
I replaced the EGR cooler with the delete kit last summer along with the old FICM with a 58v Swamps Hercules tuned by Innovative. I use a DiaBLOsport Programmer on the 100HP tune as my DD. The transmission has been rebuilt twice in the past 30,000 miles under warranty by AAMCO so I know the overdrive is not going out.
Any ideas where to start? Before I throw money at this thing again for the second summer in a row....
Please help! Many Thanks.