CEL on 1990 GSX

[Kracka]

Go to Autozone, they pull codes for free.

You can go with 550cc fuel injectors, just use your AFC to get the car tuned. Unless you actually need them though, I say just buy a stock injector from someone for cheap. Always a good idea to use some quality (Chevron Techron or Redline SI-1) fuel injector/system cleaner.