help car lost all bottom end

james87gt-
This might not be the technical advice that Kamaro Killer was looking for...but I think you're problem may be a clogged fuel filter or clogged injectors. My wife's 92GT that she used to have lost some serious power, both top & bottom end, but more on the bottom. It ended up being clogged injectors. The backfiring could be cause by a clogged fuel filter or bad plugs, wires, cap, rotor.