Why does my car still slightly yank

Hello, if you're saying there is a clunk or lurching feeling, I'd still focus on those mounts. When you say they are "okay", what checking has been done? A mount may be visually intact, but internally, where the rubber is, it can be cracked or separated, causing a sensation on initial acceleration. Beyond that, sure, you could have some other transmission issue or loose suspension or steering component. In all cases, a thorough physical inspection is important.

Have experienced mechanic test drive vehicle - most shops do not charge for this..