[94Blk5.0]

Other things to try: fuel filter, air filter, clean T.B, fuel system cleaner, tire pressure at least 35psi. Driving environment, and driving style are big factors. If you think its losing power at higher speeds, it might be a clogged fuel filter. It also might be benefical get the trans flushed(auto) and change the gear oil in the rearend. If you have a 5spd change it with some Royal Purple synthetic products, and same for the axel.