I noticed a vibration that I can feel in the accelerator pedal, brake pedal and floor board. It's not a bad vibration that would make the mirrors shake just bad enough that it's annoying. It doesn't matter if I am driving down the road or at a complete stop you can still feel the vibration. Some of the things that have been going on is I noticed the other day if the truck sits all day at work when I get in it and drive about a quarter of a mile and stop at the stop light I can see smoke coming out the tailpipe while idling. Once I take off I don't notice it anymore. I also noticed sometimes the truck struggles to start and occasionally at stoplights it will have a slight rev up and down but nothing major and it doesn't do that all the time. Does anyone have any suggestions on what this might be?