my car has almost been stolen a couple times & i wanna put on a cutter switch on the ignition....how would i do that??

 

A "kill swith" on the ign. lead would require a relay or two, [SPDT]... http://www.the12volt.com/relays/relays.asp
There are many ways to wire it, that will depend on how you want it to work, active or passive.

A simple and effective way is to use single relay, cut the ign. lead, connect the ign. switch side of cut lead to #87, with a jumper to #85 and the other cut end to #30, ground #87a and run a ground lead through a hidden switch, [SPST, on/off] to #86.
Hidden on/off switch must be on for relay to energize, [turn on] to complete the ign. circuit.
The ground to #87a grounds the ign. circuit when relay is off so the ign. circuit can not be "hot wired" after the relay.

A simpler way is to just install a small, [1A] switch on the ground to the PGM-FI Main Relay, opening that ground will prevent fuel pump from working along with the injectors. 94