Two weeks ago when I would take off from a stop light my truck would hesitate a couple times then as i got going it would start to shake and as the speed increased it would shake more. It would eventually go away in a couple minutes but when I would stop at a stop light the same thing would happen again. After parking the truck, after driving it for around 20 minutes the front driver's side tire was very hot and i could smell a smokey smell. This weekend I changed the caliper and brake pads and now it does not do it near as much but when I take off from say a stop light or stop sign, I can still feel a little hesitation and a little shake. What could be causing this? When I brake it will shake too. Can someone give me some ideas PLEASE!!?? Thanks a lot everyone.