I have a 1986 toyota van with the 4y engine in it. The engine runs well but every time it runs for about 10 minutes then just turns off...upon further inspection i noticed that it was losing spark when warm so i began testing all the sensors and they all seemed fine so went ahead and replaced the rotor, cap, plugs and Ignitor with no change in condition. I decided to look at the ECU but it doesn't seem to be damaged in any way.
If anyone has any ideas I'm open to suggestions, none of the mechanics around my area know much about these things.