Newbie with an “issue,” but no codes

I just had a similar issue that felt like jerking or bucking at high speeds, especially going up inclines and would go away after stepping off the throttle. Swore for months it was the transmission.

I did a spark plug change and discovered one of the plugs was loose and there was blow by on the ignition coil. Drove perfectly afterwards. I’m guessing it was loosing compression on that cylinder under load. Hope this helps someone cause I almost started tearing into my transmission because of this! No codes as well were thrown.