can't figure this problem out, it started happening about a month ago on by DOHC swaped 89' 240sx, it would just die for seemingly no reason with no pattern to try and go by, it happens anywhere from 30 seconds to 1/2hour after the car starts and at anywhere from idle to 7k. the only thing i have been able to determine is that when the car dies the coil isn't firing, eventually it'll fire and the car will start again. I've tryed so much to fix the problem that im about ready to just push my car off a cliff somewhere,

I tried brand new coil, different ECU, different MAF, clean all the electrical connections on the plugs, check the grounds, new plugs, different distributer, next thing im gonna do is reseal my valve cover because it leaks a tiny amount of oil into plug hole #1. anyway if anyone knows a solution or even a suggestion im willing to try it. (except trash it)