Van is cutting out like it is running out of gas and then picks up and runs fine for a while. I replaced plugs, wires, distrib cap(copper), rotor, air cleaner, coil. Any ideas of what I should attempt next? I'm thinking fuel pressure gauge to check fuel pump or computer? It is not throwing any codes and ran fine towing a trailer from Florida to Maine. I guess I should be thankful of that. It just turned 100,000 miles. Frustrated