2007 Town and Country Touring, 3.8L was misfiring on cylinder 4, MIL lit and heavy knocking if the RPM's were under 2000 on the road. OBD errors were P0304, P0300, P0325 (Knock Sensor 1 Circuit, Bank 1) After about 200
miles, feathering the throttle to return home, the MIL started flashing and I stopped to have the van towed the final 30 miles home.
We found the spark cable to #4 broken at the plug. Plug (Autolite) was wet with fuel. Replaced all plugs (Champion), cables (Duralast) and, lastly, the coil pack (Duralast).
Now, though the engine
clearly runs smoother, the error erased, the MIL flashes again with P2305 (Ignition Coil
"B" Secondary Circuit), P0300 (Random - Multiple Misfire Detected), P2305 (Ignition Coil "B" Secondary Circuit) and P0325 (Knock Sensor 1 Circuit, Bank 1)