Story around the campfire is that the 2 piece adapters have a tendency to develop leaks
And when it creates a vacuum leak the truck will run for 1-5 minutes and die. Only way you can keep it running is keeping your foot on the gas. I ripped my hair out and contemplated selling my truck because I couldn't find the leak. Replaced the manifold gasket like five times and even had a propane bottle hooked to a release valve so I could find the leak. Such a PITA....
