I, changed the plug wires and plugs on my wife's 2005 freestar 3.9 wIndsor. I now have the code P1336 and poor driveability (ie misfires, surging like the trans is drpopping in and out of overdrive). Do I need to relearn the pcm if so how?

 

Your engine is an Essex (V-6), not a Windsor (V-8). When changing the plugs and wires, did you also replace the coil? Also, did you bump or pull the connector for the camshaft postion sensor? Could be it's just coincodence and the sensor just went. Not 100% sure, but I beleive that the cam sensor is used in a sequential fuel injection system to tell the ECU when to turn on an individual fuel injector. If the ECU doesn't detect a signal from the cam sensor, it will default to a batch fire mode, where all 3 injectors on either side of the engine will fire simultaneously causing misfires.