Big Cam Cummins has low power

Until a non ecm problem happens that is ridiculous to diagnose. Or ecm goes bad. I am trying to go backwards. The only things new engines are good at is running on cheaper made crap fuel.

 

I think I just looked in the mirror and saw myself. 1976-2017 Retired, except for my machine toys and fab shop.

 

You are getting huge amounts of very quality help here.

I don't know of any engine of that era and small horse that will get up and go under 80000 or 90000 etc. It takes time. You will get there eventually when loaded with a cummins.

Everyone else has hit everything I can think of, particularly the fuel system. I wish I could be examining and touching your engine to see if it's a happy one, sad one or just plain tired due to something. Non computer engines are a joy to me.