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Couple things come to my mind, is the battery or alternator. Once the car is running it then shifts to the alternator for power. You could have a loose cable to to/from the battery or alternator, a thermal short in the alternator. To check these our just inspect the wiring from the alternator and battery, ensure there is no corrosion and the cables are tight. If so, you can test the alternator by running the car and putting a multi-meter on the battery, it should read about 14 volts when the car is running, if not then the alternator is bad. On the battery side visually look at it, if it is not square or the sides are bulged out the battery has an internal short. Both of these can be check at your local auto store, ie AutoZone. O'Riley's, etc.
That is the simple, the harder would be another sensor, Here is a link to another site that has a Jeep dying while driving with troupleshooting
could it be that the catalytic converter is clogged? The pressure will release over time, but eventually will build up back pressure as it runs stalling the engine.... then taking up to an hour for the pressure to release enough to start again.
One possibility is a blocked fuel line or filter. It basically runs out of fuel and you have to wait for it to come through slowly. The other possibility is the ignition system is losing spark as something heats up. You have to wait until it's cooled down before it runs again.
All I can say is do some research online find a REPUTABLE shop and let them drive it until it dies. Three things are needed for an engine to run: spark, fuel, compression. I doubt it is a compression problem being that it is a new engine. Something is causing either spark or fuel to drop out, a good mechanic should be able to quickly identify what is missing from the equation. Find a shop with a lab scope that can test sensors that send signals to the engine computer. It could be as simple as a fuel pump getting hot and quitting. Good Luck!
My 2001 Honda Odyssey would completely lose power, foot on the gas pedal and nothing there. There were no warning lights prior to the losing power. After letting the car set for a few minutes it would start and run okay. This happened intermittently over a couple of weeks until finally it didn't want to start at all. When turning the key the car sounded like it wanted to start but wouldn't. After a quick trip to the closest Honda dealership and asking a few questions we were told that it sounded like the main relay needed to be replaced. They showed us where it was located on the Honda, we bought a new one and we easily installed it ourselves. The old relay did have a slight burned smell. My Honda is working fine now and it has been over a week with no problems. I hope this helps someone else.
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