1989 F150 slow start

Please help. I have a 1989 F150 (5.8) and the problem is that it slow starts (crank) and when I turn it off and 10 or 15 minutes later I try to start it
again, it wont start at all. I already replace the battery and the engine module, the alternator was replaced about 3 years ago.But as soon as I jump start it. it start without a problem.
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check the starter
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Cables, grounds and starter is what your should be checking.

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