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99 jeep cherokee classic 4.0 started out running rough bucking and jerking . have changed crank position sensor , plugs wires disrtibutor cam position sensor . cleaned throttle body fixed some wires . now it will drive then stalls and wont start back up till it cools down . ive seen where people have had same problem and changed pcm but nothing says that will fix it for sure . any ideas Im sick of throwing parts at it . and now it has P0340 code no cam referance to pcm