So I've done both manually shift and auto to see if my hard acceleration is probably the cause of the issue. On my road trip I literally felt the engine on the highway go up when accelerating and drops down when deceleration. As if a mount has lost its strength and gave out. The car will even jerk upon start between fueling and rest stops. Also when cruise control is turned off on the highway.... I believe the engine thinks it's down shifting and will clunk as well... also in heavy stop and go traffic you can really feel the engine go up and drop down to the point I have to manually select 1 or 2 gear until open road.