Thank you guys....I have driven 650 miles......ran perfect/solid...first tank 200 miles, was solid 7 MPG....after that missing started...IT was HOT and under hood temps were astronomical...in the last 6 months I have had a new ford improved pump installed , filter....I built a dual exhaust system,new ford 02 sensor, cap,rotor ford coil, ford racing 8MM wires, exhaust manifolds correct plugs,belts, fluids etc.....my scanner shows nothing, no lights, starts good runs good till hot....Has a MAJOR primary miss like a bad switch or major wire short....super surging...checked battery seen nothing...cleaned grounds....
Iam going to get tomorrow fuel pressure gage, another coil, and fuel pressure regulator.
I cannot leave this MH at a dealer overnight ....its all we have lol and will not stay in a motel.
thanks for all suggestions.