[Jac Mac]

Another play on that theme... grab your timing light, tape the trigger in the 'on' position and fit it to the Coil/Cap HT lead and have someone hold/watch it while you drive, if the light stops flashing your losing ignition.

Originally Posted by Jaydee

Another thing you could try. Make up a ht wire from the center of the dizzy tower and place clear tubing over the wire so that the spark will jump a half inch gap to the coil wire, and then clamp a usb inspection camera near, so that whilst your driving, you'll see if the sparks stops momentarily.
JD