My 01 is in process of injector replacement on the extended warranty ! Does the mechanic do any procedure to balance the flow rate between all cylinders ? Or, is this a function only of the orfice in the injector ! And, if the mechanic is able to do this balance, is this considered a part of the injector program and at no cost to me? Thanks, for your help ! I just dont know alot about this !!!! Dan in frigid Minnesota !!!!!!