1999 Chevy blazer 4.3 Driving about 70mph , all of a sudden the engine was like it shut off, no power. Engine will still crank, but not start. Replaced the fuel pump relay, didn't fix, replaced the clogged fuel filter, didn't work. Fuse okay. A day or two before this happened, the dist cap and rotor were replaced. It was driven about 20 miles on that new cap and rotor before this happened. Fuel pump??? I don't have a fuel pressure gauge to check that. The battery had gone dead waiting for a tow truck trying to start it periodically and having some music to rock out with while waiting.