Yeah you don’t really need xentry. You should have a member come look at this in person or drive out to a member who’s willing to take a look. There’s so many details that could be left out and things you might not notice. Losing power over a certain rpm could be a electrical or mechanical issue. It could still very well be air ingress. Did you successfully rebuild the lift pump

__________________
Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k