Tune up has been 2 yes and I also noticethis problem also existed before the jerking was the fuel gauge dnt read accurantly sometimes it goes crazy like up and down too and no check engine light is on ?
Try changing the fuel filter first. If that does not help then check the fuel pressure. Low pressure can cause this problem. Also if the ground wire(s) to the fuel pump are damaged you will get problems with the pump and sending unit. You may have a clogged filter, loose ground wire, fuel pressure regulator acting up or a fuel pump about to fail.