Ok.. I noticed there is a clicking comming from my engine compartment, there always has been. And it seems like it is comming from the fuel injectors, in fact, if I put my finger on any of them I can feel it the same time it clicks. Is this normal, or should I look into replacing them. The odometer says 116K. I bought it at 80K and while I don't have any of the paperwork on upkeep and what-not, I DO know that it was well taken care of.