I rebult top end of 86 mustang 5.0 car runs but runs rough car shakes real dad cuts off when i let off of gas pops and back fires out of tail pipes victer jr heads b3o3 cam 70 mm throdel body intake spacer headers gear drive 6al msd box distrubeter cap wires coil please help
Well the first thing to check will be to make sure that the valves are adjusted properlyto me it sounds that the valves are not set right can you briefly explain whow you adjusted the valves in your engine?
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Has any,one worked on the car recently?It sounds like you have a vaccum hose broken or just leaking real bad.More info on how does it run when you have the gas pedal down,,is it running rough,missing,popping.This will help us getting to the bottom of your problem.
very likely the fuel injectors are damaged, replace them, the fuel pressure regulator and all rubber fuel lines, also pull the gas tank and replace the short rubber hose at the electric fuel pump, I know this is expensive but even a few miles of running would have wrecked havoc on the rubber components, that rubber debris will flow through the fuel system and will plug the injector's, E85 melts it and skin for that matter.
How long have you had this problem? It could just be a bad tank of gas. Other things to check: 1. fuel pump and filter Could be running on only 5 cylinders due to 2. spark plugs/wires 3. plugged fuel injector Any problems with electrical? Like lights dimming at same time as running rough? 4. could be bad alternator putting excessive load on engine.