My mate has an NA and lately the spark is disappearing intermittently. He will just be driving along and the engine will die. Test for spark (so far tested at leads and after coil) and nothing. Try the car again the next day (to fix problem) and what do you know it works again.
The top radiator hose and thermostat housing was dodgy (signs of leaking) so we thought it might be leaking water onto the TFI or distributor, so we replaced these and it still does it.
Next to test is the TFI, Coil and Computer.
Anyone got any ideas or are we on the right track?