VR6 Jetta hiccups, sometimes hesitates.

Hi,

My Jetta has this problem for a year now, here are the facts:

1. No Check Engine light.
2. Does not hiccup all the time.
3. Sometimes when accelerating, xmission downshifts or rpms go way up and a split second later gear engages.
4. Coil pack is new.
5. Battery is new.
6. Engine grounding is ok.
7. Connected VAGCOM (free version) and MAF sensor reading fluctuates erratically when hiccups happen. Don't have any counters for TPS so don't know if the throttle flap is closing intermittently.

My hunch is the motorized throttle body. Any suggestions?