Oscillating engine speed at low load

[Saltsjoqvarn]

Hi !
I have a LQ9 engine with LS1B ECU. The engine has a BTR Stage 1 cam (223/230) and auto gearbox.
The engine has gone through tuning with hub-dyno and runs fine. However, the rpm oscillating at low TP/RPM/load/speed.
It occurs when drive at low speed (10-30 km/h) and low TP (11-13%) and no load (flat road).

Anyone knows where to start search for the problem? It seems that some parameter are to aggressive, but is it flow, timing or something else?

I want to record some data but what PID should I log?

[nonnieselman]

Are you using V7.5 or V8?

[Saltsjoqvarn]

Most comfortable with 7.5 but I have 8.0.