So supposedly that was part of the major update to OTS tunes in v2.0 tunes back in April of 2020. After that, I never had the issue on my is20, but it happens every now and then on my is38 tune from them too.
So Dave got back with me…sort of….I haven’t changed anythingThat was the reason I switched from APR to EQT. My APR tune had that part throttle stumble at @ 3k rpms.
If you have access to VCDS or OBD11 you may want to see if your Throttle mapping settings have been changed at all. We highly advise against it being changed while tuned.