Having the same problems over and over.

Throttle body can't be reset on ross tech/vagcom, it comes up with an error at about 30-40 degrees.
When driving, engine almost stalls coming off boost after pegging it or it jolts backwards and forwards on %5 - %10 throttle 80 percent of the time.
Replaced ignition barrel and that somehow gave me more torque and consistent boost but didn't help. Checked the wires from the ecu to the throttle body positioning sensor and they all have continuity. Nothing else comes up when it scans other than to reset the throttle body/reset manifold. Had Volkwerke try to reset the throttle body but to no success. Used a brand new throttle body from them too and it did the same thing at the same degrees.

If it isn't the wires, what else could cause the throttle body to not get signal to the ecu? Could the ecu be the problem?
Checked the spark plugs and they're all sweet and I'd imagine it wouldn't be coil packs. No dash lights have lit up ever since owning it (it's had this problem since i bought it).

Could it be VVT out of whack? but then that still doesn't explain the throttle body not working.
I'm running out of ideas if anyone has any insight/knowledge to the AGU/1.8T drive-by-cable engines.
I've scoured the internet for the year that I've owned this car and tried everything but still to no success.

Thanks
Todd