Found this on a Ducati site.
Sounds like surging to me.
"The TPS on my S4 had to be adjusted by the dealer to cure an engine stall problem when pulling away.
The bike is still a little jerky comming back onto the throttle from over-run and the engine hunts between 2 & 3,000 RPM on partial throttle."

Sounds like surging to me.
"The TPS on my S4 had to be adjusted by the dealer to cure an engine stall problem when pulling away.
The bike is still a little jerky comming back onto the throttle from over-run and the engine hunts between 2 & 3,000 RPM on partial throttle."