I would unplug the TPS, attach a DMM with a bargraph, set to ohms, and rotate it slowly while watching the bargraph. If it get's jumpy at all, you have found a worn spot or two in the rheostat, which is causing the signal to the ECM to vary when it shouldn't, causing a jerking motion.
Or it could be you bogging the engine, but I'd check the TPS the way I described.
Take care,
-Chris
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