If you have no knowledge about these issues and want to use the Red Box ECU - or in general understand why sometimes engines behave in a certain way - on this pages a great explanation is given - just a few minutes read and fully worth it!
Open Loop vs Closed Loop: Understanding Fuel Injection
Understanding how open loop vs closed loop modes work in fuel injection — problems they can cause, how to identify them, and how to tune them out.
motofomo.com