Loss of Acceleration

Need more info to give a good answer. First I would attach a fuel pressure gauge and see if the pressure is dropping when it dies. If pressure is good you can rule out a lot of possible failure points. If it's low the fuel pump is a likely culprit. It could be a vacuum leak causing un-metered air to come into the engine. Could be a mechanical failure in the peddle or throttle cable. Could be a restriction in the exhaust. Could be a failing ignition system. Could be a restriction in the air intake. Could be bad gas. Could be a few other weird answers that I won't even put down because they are very unlikely. You probably need to start gathering more info so you can rule out some items and narrow down your search.