I am trying to desperately get to Maryland for the Regional Qualifier in June. The only way we can go is if we have our RV running. There is a problem with it and I cannot figure it out. The RV is a 1989 John Deere, Pace Arrow Class A. The engine is a Ford 460 with a Holley 4bbl. It has an external (in front of the tank) fuel pump. The problem is when I try to drive at highway speeds the engine will start to stumble and “Pop†out the exhaust. Driving around town up and down hills it runs fine. Once on the highway it starts acting up. It doesn’t take long, about a ¼ mile. If I pull over and take off again it goes fine until it gets to highway speed then the same thing. I have changed the following. Cap, rotor, Distributor base cap, wires, plugs, fuel filter, rubber fuel lines. I have checked the following: vacuum at the distributor is 18†at idle. The vacuum advance will hold a vacuum and pulling a vacuum on it with a pump it will change the timing (you can hear and feel it) while its idling. I don’t know what to do next. PLEASE HELP!!!!! I cannot afford to put it into the shop, so this is not an option!!!! If I cannot get this running we will not be able to go and Spaz will be Heart Broken.
Thank-You
Bob
Thank-You
Bob