92 ford E350 econoline club wagon engine problems

Your 92 ford e350 club wagon 5.8 v8 gas it having problems when driving it like to cut in and out and at a stop in drive it wants to die or starts jumping you have put new plugs wires coil and rotor? what eles could it be please help it my only transportation to work and need to figure out whats going on with it:banghead: