1991 Chevy S-10 tuning

Parts you'll need:
6 spark plugs
Spark plug gapper
Wire set
Cap and Rotor
Pencil

Tools:
Spark plug socket
Socket double U joint
1 1/2" and 3" extension
12" breaker bar
Jack stands

Do not remove the spark plug wires yet!
Pull the cap, leave the plug wires connected.
With a pencil, mark where the rotor ends are
Pull the old rotor, put the new rotor on, there should be at least 1 flat side on the rotor stem, if not, line the ends of new rotor to the pencil marks.
One at a time, take the plug wires and connect to the new cap. Make sure the retaining screw tabs on the new rotor are in the same position as the old.
Secure the new cap to the distributor

The spark plugs need to be done from the front wheel wells.
Start on one side, jack the truck up, put a jack stand next to the jack under the frame. Lower the lifting jack. Remove the wheel.
One plug at a time - Remove the plug wire.
Starting with the forward most plug -
Slide the Plug socket on the old plug, put the double U joint on the socket then the ratchet handle.
Break the plug loose and turn untill the ratchet stops "locking", remove the socket parts in reverse of assembly.
Remove the plug with your hands.
Put the new plug in.
From the top of the engine compartment, match the length of a new wire with the old one. Connect the plug end of the wire on the new plug, then connect the other end to hte cap.
Do this with all of the plugs.
The last wire, the one in the center of of the cap goes to the ignition coil.

Final step, timing. You'll need a timing light and other wrenches. Take your truck to your favorite mechanic and have them check/set your timing.