The CPS is located at the 11 o'clock position on the bellhousing looking from underneath the vehicle. If you unplug and then plug in the connector located near the intake manifold and it starts when it wouldn't, plan on replacing it very soon.
You will need to jack up the vehicle in the front, support it with real automotive jackstands, and work from underneath. Arrange the best lighting you can, and use 1/4" drive extensions about three feet long, with a universal connector for the socket. Use a magnet, bubble gum, or something to hold the bolts to the socket. If they fall into the bell housing, removing the transmission to get them becomes your next chore.
When the bolts are out, remove the CPS, and replace. There is a modification to slot the ends of the bolt holes, removing only what is necessary to slip over the bolts so that they will not need to be removed completely again.
Reconnect and start the motor, if that doesn't do it, check all the grounds and the main plug through the firewall.....good-luck