The weirdest thing, took the car for its first shake down drive. After about 5 minutes the engine started to run rough. Came home, pulled each plug wire off, one at a time, with engine running. Passenger side had good spark from each wire to each plug. Driver side had poor spark from each wire to spark plug. The spark plug wires are new. I put on a different coil and changed the condensors from side to side, still the same thing. How can this happen when each side of the distributor fires both sides of the engine. This may be nothing to do with it, but the iron heads are coated with ceramic header coating. The battery cable is grounded to the passenger side head. I wonder if the driver side head is not grounded enough? I'm stumped.