340 Not firing on all cylinders

Sorry guys, I thought I mentioned what the fix was!! It was the lead from the ECU to the - side of the coil. The PO had just wrapped it around the post under the ring terminal of the wire to the Tach. So when I looked at the - side all I saw was the one wire (no evidence of a broken wire or connection). I put a new terminal on the end, reconnected it to the coil and I was back in business!!

Dennis