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My car has done this forever. It is so annoying, everything you described is the same as mine, its so audible. The other day it backfired through the intake, I am not sure whats up. This throttle response is so slow. It seems like it takes forever to go from 1500 to 4500rpm. The car really feels like its pulling ignition timing, and that would make sense to the octane claim, btw, last time i used premium for one tank I am not sure if it really made a difference.
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