Edelbrock Pro-Tuner, User Manual

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Generally, you will want to use very little if any D gain, slightly more P gain, and fairly
small I gains. Small adjustments make significant changes. Tune the gains at operating
temperature. Use the minimal gains required to provide smooth idle and prevent surging
or stalling.
Gain (Differential) This controls the dampening affect of a system. Example:
Increasing the Differential gain for an IAC will control how
much the IAC anticipates a change and how fast it reacts to an
input. The D term deals with the "rate of change" of the
parameter. The faster the parameter is nearing or going away
from set point - the D term output will increase.
Gain (Integral) This controls the acceleration based on change, or basically the
how fast the rate of change is adapted or integrated. Example:
Increasing the Integral Gain on an IAC will make it change
faster and be more “sensitive”.
Gain (Proportional) This controls the resistance to change or “stiffness” of the
system. Example: Increasing the Proportional gain for an IAC
will affect how long it takes to react or change. The larger the
change (or “error” based on current position) the harder the
actuator is driven. The P output is proportional to the error.