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Start with the fuel system. Does it have enough pressure? When it looses power is it the fuel pressure too low? Are you running on diesel or natural gas? Is the regulator freezing up?
If your alternator is going bad that would cause your battery to be drained since your car electronics are just pulling from the battery. Most auto part stores have free battery and alternator testing. That is where I would start.
Check the battery cables. I had the same issues with my 96 tacoma, The battery cable connection at the battery can be cranked down but still be loose. Hard to explain, doesn't make sense, but just check it out.
Next time it happens, turn the key to the "on" position. See if you can hear the fuel pump engaging, sending fuel up to the motor. If not, you have a fuel pump issue. It doesn't seem often this happens, but when a vehicle is started, the fuel pump feeds gas to the engine. After the engine is started, it's more of a pressure thing, letting the fuel just flow. It may not be getting that extra push, when the pump is cold.
I hope this helps, let me know if I can be of any more assistance! :)
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