cranking my 99 jeep will not?

i have a 99 jeep and replaced the fuel pump, still have trouble cranking it, so then i put a fuel injection in it. Still have trouble cranking it. So then I took it to a shop that i use a couple of times before, they said they could not find anything , but that it was a issue with the key a security issue. Could it be that?

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  • 1 decade ago
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    If black your key is, your trouble it is not. If gray it is, a light flashing red, a hundred dollars is dead.

  • 1 decade ago

    try a crank sensor?????????/

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