88 D100 issues

Update. Went out to start the hunt. Fir ***** and giggles tried to start it. It fired up. I shut it off. Found the ground that goes from the fire wall to the back of the block. Wire brushed both connections. Put back on. Truck will idle but still dont sound right. Put it in gear and it stalled. Restarted. Tried again. Wanted to stall.