Drop of RPM in daily Driver at cruise speed - but TCC says locked

[fakky]

Need help


So I have a drop of rpm 1950-> 1450 around 40mph and hptuners says not TCC - TCC mode = Locked

Any ideas on how to track down ?
lq4/4l65e

logfile attached
Youll see the drop in RPm around 59seconds into the file -> through to the end ..... i.e the last 1/4 of the log.

surge.hpl
thanks !

[fakky]

I do notice in tune that the MAP sort of spikes at the same time rpm drops ........ dont know if thats cause and affect or just what happens when rpms drop on engine