Same thing happened to me. Somehow I reversed two spark plug wires. Since I KNEW that I had the plugs in the correct firing order, I nearly tore my hair out trying to figure out what was wrong. I finally gave up and took it to a shop where they checked the firing order on the distributor switched two wires and fine tuned the timing. Now it purrs.


58 Fleetside, 235, "The Old Buckin' Bronco"