Most of the time you only need the oring seal kit and a can of BG's 44K in the tank to fix the TBI injectors. (or a bottle of CD2 Maximum Fuel Economy, but it seemed to go away @2002. I tried to save as many as I could. It got my '86 MJ 25-30 mpg average on the trip to Ouray in '02 with a 6,000lb gross weight, 3" lift and alignment knocked out of whack by a delivery truck in CO.