Finally got everything, I thought, with my 1951 Dodge Dump fixed & decided to make a couple trips to the rock quarry. No issues, made (2) trips. After that, I took an hour break. Decided to make (1) more trip. On the way back it started to miss. I had to let off the gas, coast awhile amd them resume. Could not give it full throttle w/o it bucking & chucking. I just installed a SS heat shield, hoping that would do the trick, but not the case. could this be a timing issue? I recently converted to 12 volts & installed Pertronix kit. I have had the mising issue in the past, before converting to 12 volts.