1990 Mazda Bravo engine electrical

Howdy, I would like to pick up on a post by Jaxxxon of about 3 years ago, listed near the bottom of the second page of this make and model. I rebuilt this PU about a year ago and it ran strong until it developed this problem. It starts and runs fine until it starts to warm up, then dies. I can hear the relay behind the glove box clicking, engine starts to cut out, then dies and wont start until it goes cold again. I have tried all kinds of tests, checking spark, fuel pressure, timing, compression, valve timing have concluded that the problem is electrical. Found a running pu at junk yard and bought all the electronics, changed one part at a time, distributor, coil, igniter, computer, with no change. Then purchased new temp censers, (coolant and air), wires, plugs, fuel pump, fuel regulator and dampener and fuel relay. Still it starts good when cold and runs for about 5/10 mins then dies and will not start until it is once again cold, I can unhook mass air flow and makes no difference when running or starting. I work on cars a lot but this has me stumped!