Electrical Problem

When the problem occurs, does it restart quickly? If not, have a helper crank it while you visually check for spark at the plugs. If spark everywhere, use a gage and check fuel pressure. Intermittent issues can be hard to find, you have to test when problem is ongoing. Can you check for possible mil codes? You cycle the key to get mil codes, you turn key just till dash lites come on, no further, no crank. Cycle key, on--off, on--off, on, then the mil starts flashing, you count the flashes to get the codes. Your looking for two digit codes. I haven't looked at my database, but, that procedure should work, if there are any codes.