in my 69 ford e100 that has the 290 straight 6 it just started doing this but it runs rough and a stop unless the choke is pulled all the way out. so i did a pretty good tune up on it( plugs, wires, cap, rotor, ignition coil, fuel filter) and now it will start and idle but while in gear or under load it seems like one or more cylinders are dying out. can anyone help out that has ran into this.... thanks awolf