I don't have an opinion on what rpm to balance at off idle but there are several ways injectors can be imbalanced leading to the same problems as air imbalance.
—Different flow rates due to manufacturing tolerance or age
—Different turn on delay
—Different turn off delay
Every several years injectors should be cleaned and checked for matching. My goal is less than 2% difference.
Then to minimize the effect of injector imbalance you can richen the mixture through O2 sensor shifting.
roger 04 rt screwed with this post 03-31-2013 at 08:29 AM