Q: Why won't my Jeep run? It will crank up but won't run.

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My uncle had put tin foil in one of the ports of the computer in my 1998 Jeep grand Cherokee thinking it would fix a "loose connection, it didnt work, well I got a new computer , put it in, but now it will crank but won't start, what could be the problem?

My car has 40000 miles.
My car has an automatic transmission.

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