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If you are running a stock tune or a Cobb OTS tune, then the engine is probably knocking so the ECU is pulling timing. For the jolting, your motor/transmission mounts may be shot. Under WOT, the motor does move a bit and will jolt back when you back off the throttle.
Stock tune does not like heavy acceleration in 4th/5th gear at low rpm (under 3k rpm), many folks have bent their rods this way.
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