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Note: A motor home or a recreational vehicle if used solely for personal use is exempt from the requirements of the Truck and Bus Regulation. There is no need to report in TRUCRS.
I have the 8k power tech. I replaced the belts after about 3 years one broke.
They may have been old to start with. Belts should last about 10 years. Had to pull the unit out to change. Easy to pull out as I have access to fork lifts. Could be done with a floor jack just not as easy.
Not sure if you have the same engine as me or not.
I had a similar problem with the exception of the fule pressure.
I have a 2003 ISB 5.9 300 HP
If the fuel filter does not cure it.
Then look at the intake horn both small ports going to the EGR differential pressure switch were pluged. It would loose power and surge. Some times the check engine light would come on other times not.
I was getting trouble codes on my Silver Leaf VMSPC
ERG differential pressure invalid
VGT callibration error.
Pulled the intake horn off and cleaned the ports.
PM you email and I can send you pics.