I'm looking at an '01 with 146K on the clock. It had the injectors replaced at 50K in 2004. Were these injectors better than the originals or the same design with the same flaws? In otherwords, is there a possibility that the injectors could need to be replaced again? Is this something the dealer has to do or can a shade tree mechanic get it done in the driveway over a long weekend? Any other issues to be aware of for this year truck? He's asking 11,500, CC, lift, LB, nice rims, very good overall condition. Looking to get out of the '99 in my sig...................