Throttle sicking and jerky in first gear

Hello, I've had my jeep for about 6 months and it runs great. About three months ago, I noticed that whenever I went to shift it seemed as if my throttle would stick because while I was shifting with the clutch in, my RPMS were still accelerating along with my speedometer and it seemed as if my engine was revving during the process (my foot was OFF the gas by the way). It would do this for about 10 minutes while driving then randomly stop (I always let it warm up for 5 minutes before driving, but still have this issue). I had a mechanic drive it while this was happening and he suggested getting a good quality fuel cleaner because there may be build up on the throttle. After I cleaned it out, it seemed to have stop for a few days. But now my jeep seems to drive different. When I'm in first or second gear going a slow steady pace (lets say in a parking lot for example, or traffic, or a gas station) it gets really jerky. No matter how easy I try to push on the gas it violent jerks like I don't know how to drive anymore and its very frustrating because it has never used to do this. It only does this when I am in first and second when my RPMS have lowered. I'm just wondering is this how its supposed to run now since I've used to fuel cleaner? And also, it seems that my accelerator is starting to stick again so I am wondering what my cause that also! Thank you