1999 ford ranger 4.0 starts and shuts off immediately?

Hi guys first i want to thank you for all the help that i can get i have a 1999 ranger 4.0 v6 2wheel drive with manual transmission, today i drove to my dads house 5 minute away, when it was time to go back home i start the truck put it in reverse and i was able to move it back a little than it shut off. I try to start the truck again it shuts off immediately, i try it a few times and it kept doing the same. I know i have a leak on my valve cover gaskets do you guys think that might be the problem? I just bought the truck and the old man that sold it to me told me that he actually had to replace the spark plugs almost every 3 to 4 months because they were getting oil and it after a while the truck had problems to start. Does that sound like something that it could happen? You guys think that might be the problem? Please i need help i need to get my truck fix as soon as possible.

Hi so it needs servicing and maintenance

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