JDub$ter

I searched everywhere and can't see anything similar to this issue. I have a 93 chevy silverado with a manual 5 speed. It has started hopping/jerking at low speeds while in traffic. As long as you are accelerating there are no issues but say if you need to drive 30MPH steady in third gear it will literally start hopping unless you engage the clutch to compensate. Above say 55MPH there are no issues. Truck runs great and just started this a month ago. Any thoughts on what could be the issue would be awesome. TIA