Thanks for the response.
I can answer a few questions, but I'll get onto the clear hose and fuel pressure kit later.
It does not stumble, it just stops. No smoke from the tail pipe. It does not feel like any drag on the engine.
The transmission was rebuilt about a month ago, but I can't rule...
New to this forum and relatively new to the 6.5 although I've had a GMT400 for at least 20years.
My truck is a 1995 Silverado K3500 dually. A previous owner made some mods that have been disastrous. He put electric fans on the tranny and oil cooler then took off the fan clutch and replaced it...