My timing mark has worn off and I can't seem to get it set correctly. It is close but hesitates when i accelerate. I can't feel much of a difference in the engine as I try to set it. It either stays pretty much the same as it is now or gets really bad and I lose lots of power. I have just done the full tune up but could the hesitation be caused by something else. It is more of an annoyance really right now but anything that might help the feul economy I would definately like to do.