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Is your engine the 4.0L 6 cylinder or the 4.7L V8?
Also, will the engine crank but not start, or does it not crank at all? If it cranks, it's not the anti-theft on this model.
The most likely cause is the crank position sensor. The only way to test it is with a lab scope, so I would just replace it and hope it works. Here is the procedure.
here is a diagram.