Autozone will pull the code(s). Free. Post the code numbers.

 

Will a bad injector cause a misfire but no codes? Plugs/wires will defintely cause a code if they go bad right?

 

Not sure about OBD II cars, but my '94 doesn't throw a code for a burnt plug wire.

Andy

 

OBD-II does set codes for misfires. OBD-I does not.

Get the 97 scanned with a scanner that can access the "GM Enhanced Parameters". With that scanner, you can pull up the misfire count, by individual cylinder. That will tell you if its a single cylinder, cross-firing between two cylinders, a truely "random" misfire, etc. Its going to be a lot easier to find the problem if you know exactly which cylinder it is. The cost of a good scan will be less than throwing the cost of a new Opti at it.