Cat C7 starts, idles, but won't rev up in gear.

Excellent news Randy A.
When it happened to us the cat service centre we limped into did not solve it either. They pulled the codes, they said low fuel pressure, changed fuel filters but it didn't help. My husband and I talked it out while camped overnight in their parking lot. Husband pulled out the filter the next morning, run perfect.
Had to search around a few places for a replacement (cat service didn't have one). Finally found a cleanable one. Back to full power :)

Thanks for the follow-up.