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I had a car in my shop that would run for two min. and die. wait a min and would start right back up. Turn out to be a cracked rotor , the crack would open when it warmed up enough. thy that.
To check basic spark get a spark plug tester from auto store for about $5. Remove fuelpump fuse. Remove spark plug, connect to tester. Have a buddy crank car an watch for spark. Do this for each plug. No spark is likely a bad ign. wire or coil. Be careful not to touch electrical wire/plug while cranking as they put out a lot of electricity.
If a spark has no path to discharge, it will often find a weak one or create one. If your wires or plugs are so bad that they cannot pass a spark, the coil will discharge elsewhere. It is a great coil. I have seen brand new plugs completely disable an engine. Completely. I have seen wires completely fail on their maiden voyage. The plugs were Champion BRF52 on a Ford, the wires were Belden for a V6 Mercury. I do not recommend Champion plugs, at all. I do however like Belden quality. You would not suspect them, but... Suspect them. Pull one out lay it on a steel part of the engine, and see if it sparks. If not, replace them. For wire, try to start the engine at night, watch in the dark for arcing wires. Replace them.
Check your battery as it supplies juice for the coil. Then check your coil or coilpak and the crankshaft sensor. The bad spark may be an underlying reason for how the truck has been running.
Do you know if the fuelpump is working? The Inertia sensor may have tripped while you changed regulators. You may need to reset the button on it to connect the fuelpump.
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