1997 Holiday rambler Endeavor LE Ford 460

Thanks for the replies… I just went and picked it up today to take it the exhaust shop. Drove it without any issues. It does feel like there is not a lot of power but I figured that is because it is a gasser and is so big. I don’t expect it to be like a hot rod but figure it should have more power than it does. As it is, I wouldn't trust trying to drive through even the smallest of mountains! It has sat for a week since I parked it so leads me to believe the excessive exhaust back pressure is causing the lack of power and maybe something to heat up which eventually causes it to lose power. I am told braking is affected when the exhaust back pressure is excessive.