light load surge finally nailed

[Camel]

You will find most of the problem will be in low end fuelling and is usually at light throttle where the IAP A/F and TPS A/F are floating from one to the other and if the settings are not correct as they jump back and forth to each other the transition creates whats felt as surge effect.

So true, but with Gen II this is not an issue because IAP (Intake Air Pressure) has an influence across the TPS (Throttle Position Sensor) range.