If it's the same as mine, the jerking goes away once you press the accelerator a little further. It only happens when the throttle is barely pressed (like slow acceleration above 45mph) or accending a very slight grade at a constant speed. The throttle sensitivity on the miller cycle is such that driving normally requires very small throttle inputs to keep from lurching forward. In comparison to the 2.5L, it's on the opposite end of the spectrum requiring large input for small changes in acceleration at some speeds. I was thinking that the TPS is sending erratic output to the ECM when it is in that almost closed position or the closed throttle position sensor is sending "open----close-open-------close-----open" causing the jerking. No way to tell for sure until you (and I) drive with an OBDII data logger and monitor the TPS and CTPS output while the jerking occurs.
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