Well my 2001 60 horse merc has been being moody When I accelerate, it wants to bog down right before getting on plane. It always eventually gets there but almost wants to die when accelerating, and has a few times. I’m stumped, well sort of It’s a 4 stroke model, with 4 carbs. My fear is the jets are partially blocked. About Chevy Accelerating When Down 1998 Truck Bogs . Not literally gone, but pretty much fried. The Certified Service technicians at your Chevrolet, Buick, GMC, and Cadillac dealers are expert finders and expert fixers. ... 7 350, this truck starts, idles, and drives fine, but when you go up a pretty steep hill the transmission will downshift.