What should I do with my car?

Hey guys and girls…
I have an old minivan it's 2000 model for Ford, as I said it's an old car so it's engine is also old and it is giving me problems, I have no money to buy a new car or a new engine so I am thinking to change its parts one by one. Please tell me how can i do this I mean which parts I should change to make the engine run good.
Thank you

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