The reason I would rather replace just one is because I hit a deer on that side of the car back in november. Im just assuming that maybe the vavle has been jolted and cause an individual lifter to be out of sync and make it go bad. I just talked to chrysler and my dealer cost on an individual lifter is 10.81 and to do all 6 (intake lifters) its 2.3 hrs of labor and my rate of 45.00 hr so the most it could cost me is $146.74 give or take a bit. and if it is one lifter I will just replace them all for that price.