The motor will sometimes die, when I am driving 50mph +. I pull off the road and then it will start right back up. Other times, it will just lose power. When I step on the gas I get no response, but it never completely stalls. Any Ideas? Just changed plugs, wires, dist. , pcv. It has been doing this for 2500 miles or so. Some days it won't do it and other days it does it every 10-20 miles. It doesn't matter if the gas tank is full or almost empty.

[update!!!!!!!!!!!

Problem Solved. It Needed A Fuel Pump, Which We Replaced In About 1 1/2 Hours