The car was running perfectly and lost power during acceleration at about 25 mph. I had driven about 20 miles at that point. As it died, I tried putting it back into gear for a rolling restart without success. After it came to a stop, it cranked vigorously without any sign of firing. Under the hood the filter bowl appeared to be full. There was plenty of gas. I'm now looking for information on how I can test the electronic ignition system (and as suggested by another forum member, the coil). I might add that AAA managed to leave me stranded for four hours, sending a lift from a town so distant that the driver had no idea where I was. On the plus side, the lift driver was competent and got the car home for me. Now for the confession that may be relevant. I had been working on the car's electrical system for several days, issues with turn signals and the PO's lighting applied to the reflectors above the tail lights. Everything was again functioning. I was aware that it is risky to leave the ignition turned on when the car isn't running. I have two electrical shutdowns on my car, the one in the boot and a breaker under the hood that many in our Healey club installed. Despite constant switching the car off and on to avoid burning out the ignition electronics, I came out one morning and found I had left the car overnight with ignition on. I have driven the car several time since this blunder, but know it could be the origin of the Pertronix ignition--if that the was the cause and want it on the record. At 86 there are signs of slippage.