Cruise control is a special case of idle: engine rpm must be held constant with a controller algorithm.
Cruise control requires a bigger idlevalve than vanilla idle
(surprise: higher power, more air).
Constant power cruise is needed for PortInjected/SequentialInjection and GenBoard/AutoTune
so that the best injection-degree can be found that gives
lowest pw for a given ( VE, RPM) while outputpower, is held
constant.