Bought a 96 trooper with the engine out of it, had eaten a spark plug. Bought a 3.2 out of a 97 Rodeo with a lot less miles. Put it in with all the Trooper sensors and smog stuff. Started it up and runs great. No CEL just the rear antilock and brake light were on. Haven't figured that out yet. Heres my problem, after I got it running took it up and put some gas in it. After putting 20 bucks in it started it up and the CEL was on. Checked the gas cap, in good shape and tight. Took it home and plugged it into my lap top to read the codes. No luck the two computers are not talking to one another. Took it to AutoZone and they could not get their scanner to talk to each other either. Any thoughts as to how to get these to devices to talk to one another. Also any thoughts on the rear anti lock brake light. I am going to check for loose connections tomorrow.