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My Jeep starts up for about 3 to 5 seconds and then cuts right off but it doesn’t do this all the time I’ve changed my battery and anything else that I thought it was wrong with it but it’s still doing it can you help me

Sounds like a fuel problem, maybe water in the fuel tank, add some dry gas to the tank. Gas will turn to mostly water if it sits too long and sometimes you will get a little water with your gas when you buy it. Let me know how you make out.