[HotZ28]

It is possible that you may have PCM (computer problems) but that would not cause all the problems you described. When the transmission does not engage, is this soon after you start the engine when it is cold, or after it has been sitting overnight? Will it engage if you shift into 1st gear? Are you absolutely sure the battery cables are clean & tight? Have you ever changed the crank position sensor? Have you checked the battery positive cable to the main fuse/relay panel mounted on the firewall to see if the terminal is clean & tight.

Word of caution, always remove the negative (-) battery cable first when working on anything electrical. Electrical surges & spikes can damage computers, but check the obvious things first!