My 1970 Cuda has a 360 with a Holley 4150 750 cfm carb. and expensive Holley fuel pump. I filled the fuel tank with 93 octane Marathon gas. Started to drive at a steady speed down the road to a destination about 3 miles away. The farther I drove, the rougher the engine ran. Started sputtering until it finally had enough. Checked the plug wires and found some full of corrosion at the distributor. (I have electronic ignition) # 5 was to the point of broken tabs on end of wire in distributor. Wires were new last October. Bought new cap, rotor, wires and spark plugs. Installed correctly and in proper firing order. Very hard to start and back-firing out of exhaust. After troubleshooting found a good spark from coil and no spark to plugs. Bought new distributor and still can't keep running long enough to check timing I'm almost 100% sure it's not 180 degrees off because I put new distributor in exactly as old one was taken out. Thinking maybe bad gas but not very likely. It has been cutting out when sitting at red lights but starts right up and ran fine. Any ideas would be helpful. thanks
