I am installing a 2000 4.3 Chevy into my CJ2a. I will be using a manual transmission and this engine from an Astro van is auto. I will need to either have a reprogrammed computer or some other way of engine management to control the fuel injection and the lack of the auto transmission. What have you done? What worked and didn't. Were you able to reprogram it yourself or send it off? Did you just get an ECM from a manual? Look forward to your replies.