I have error code 23 in my 1988 firebird with a carborator and can not figure out what or where the sensor is can anyone help?

 

There were no carbs in any of these cars in 88.

Of course someone might have put one there, but then, there's no way for us out here to guess even what kind it is, let alone what they did / didn't do about the EFI computer.

Verify what you've got. Telling us which engine you have might also help.