5.0 GL no power above 2000rpms

[Sean 66]

Please help...I have a 2004 5.0 GL Volvo penta, runs great in the driveway turns 5000rpm, under load only 2000, can’t plane very frustrating. Compression check is good, new plugs, wires, cap rotor, fuel pressure 8 psi, rebuilt carb, moved up to larger jets, 5.5 power valve 28 squirter. Worked great once..3800 WOT. Now 2000 WOT is all it will do.
im ready to burn it to the ground. Any ideas? Please?

 

[alldodge]

Should answer the questions in the other post before starting another with same question

https://forums.iboats.com/forum/eng...rives/10908447-flat-top-end-hard-to-plane-out