Please make sure this is a 97 Model year as the 96 system is way different. What is the build date?

Does the throttle cable only go to a sensor on the left fender or does it go to the engine?

With either model year, you will need a scanner that plugs into the under hood 38 pin connector. Only the engine will come through the under dash OBD connector. Also be aware that there are 38 pin to OBD 2 adapter cables but this will still only get you the engine side.