2003 Regal 4260
Running 3,500 RPMs 19 knots for 50 minutes
RPMs dropped to 2,500, then 2,000 then 1,000
Temp. steady at 165 - 170
After limping home at 8 knots, next day ran 20 minutes no issues
Checked gas - no water
Manifolds replaced 3 years ago (low hours - 100)
Replaced fuel line...