I have tuned my chip to be around the 128 BLM. The O2 sensor is fine, I have a catalytic convertor.

But I still have a rich gas smell when Idling that I can't seem to figure out why.

The only thing that I can think of now is I do have 2 cylinders that are fouling. Maybe these cylinders are causing my rich gas smell.

The only thing I can think of are the injectors. Now is there anyway I can identify a 305 injector opposed to a 350 injector without removing them?

I live in Australia so who knows what kind of injectors have been put in if they needed to be replaced. They are all black but that does not really say much they could be anything.

I am thinking maybe those cylinders have a larger injectors installed and flowing too much fuel.