New to the forum, but been on the sidelines as a reader for some time now.
I drive a 2001 24 valve NV5600 cab & chassis with HO 5.9. I have an issue that seems to show up as the temperature drops, but not always when cooler. The truck starts fine and takes off fine then all of a sudden power loss. No throttle response until speed drops to 35 mph (in sixth gear, different in other gears) then power kicks back in and we are going again for a bit until power loss repeats.
Have also noticed when this is happening I have no operating temperature increase on the temp gauge. Can say the gauge is true due to no heat while the event is happening.
Over the time I have owned the truck I have changed the crank position sensor, throttle position sensor, speed sensor, MAP sensor, new rebuilt NV 5600 and I'm sure I'm forgetting some other stuff.
Codes have shown injection pump bad, however, with discussion with Blue Chip pumps I find it hard to think this pump has been going bad for a couple years now with this being my daily driver.
Any help would be greatly appreciated.