My brother has a ForeTravel that he's been having some trouble with. He's recently had the motor replaced (1 yr ago) with an 1985, 454 Chevy engine and it has a Holly Double-Pumper. He'll be driving along just fine and the motor loses power and will hardly run. It appears he can let it set for a bit then start it again and that cycle starts over, but maybe it wonâ€™t go as far the second time. He's replaced the fuel filters (the inline and carb filters) and has converted to an electric fuel pump. The problem persists. Any help would be appreciated. THANKS!