4th owner to wrangler 97. Had problems with backfiring/sputtering/loss acceleration. went to every site tracking down this problem. Finally followed steps to clean PCM (powertrain control module located above battery on passenger side) connectors, and secured them with wireties. Also secured two connectors to the right with wireties and padded to firewall. Also noticed problem existed as with others when turning, so I repositioned the battery with it's own clamps to keep it from shifting/rubbing against wire harness to pcm. so far this appears to have helped!!
Now have a muffled backfiring/stalling after a 25min cool down. Noticed my evaporator surge valve/solenoid was not working, also lines contained deposits, and main line to intake manifold contained large carbon deposits. Replacing valve and canister, could be having a problem with vapors not reaching manifold and adding to lean mixture that appears to result in backfiring (as I've been told). Also going to try alittle jet/carb cleaner into manifold to see if this helps clean carbon.