noticed something similar felt like my tranny was messed up because it was jerking. at maybe 60-65 if i lay lightly on the throttle on the interstate it bucks unless i push down further. My guess was the transmission needed to downshift but the electronics must glitch at certain speeds versus throttle position. I have Racechip and in most other cirucumstances never experience it. My gut tells me not to lug in economy setting at highway speeds so i usually put tranny in second position.
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