Its a Nissan; But this is my home: z24 8 spark Power loss & engine shut off

[darkone]

I took a short trip yesterday in my 1984 nissan with a z24 8 plug engine to get some sand for my 70 chev.

what i noticed early in the trip:
slight lurching
minor flickering of the dash lights
reluctance to reach freeway speeds


what i noticed on the return trip:
extreme bogging down.
inability to make it up any hill without excessive clutch engage/disengage.
simultaneous headlight/dash/engine shutdown (everything but breaks was powerless)
key in start position after pulling over on shutdown; magically power came back within 1-3mins
i started it drove about 100yds and complete shutdown again.
once again magically power returned after about 3-5 mins
engine was bogging down more than ever


what i have done:
replaced the battery
cleaned all terminals
cleaned all wires

any guesses would be much appreciated. i talked to a auto electric guy today and he said to check out my fuses. anyone have any other guesses?