Changing the injector flow is a course tune option.
Increasing injector from (from 61 lbs/hr to 63 lbs/hr) makes everything LEAN, because the PCM thinks the injectors are flowing more than they actually are and reduces injector BASE Pulse Width.

Decreasing the injector flow (from 61 lbs/hr to 59 lbs/hr) makes everything RICH, because the PCM thinks the injectors are flowing less fuel than they actually are and increases injector BASE Pulse Width.

The BEST tool for tuning fuel (RICH or LEAN) is a Wide Band Oxygen Sensor (WBO2)?

dave w