I have a '35 V12 Packard with a dual coil. Problem began about a month ago. Car would start and idle with no problems but when I drove the car especially up a grade the car lost power and the regained power on the down hill. Initially I thought that I may have had a fuel problem. I drained the gas tank, installed fresh gas, changed the electric fuel pump (in line before the manual pump) and then started the car. As before no power going up hill. I then pulled one of the plug wires and grounded it and got a small weak spark. New points and condensor installed but same problem. Started the car again and ithis time it idled somewhat rough and then it died on its own. Rechecked for a spark at the plug wires and this time no spark. Is this a coil issue? If so who do you recommend to rebuild the coil. Thanks for everyones help.