My 2002 dodge durango is idling rough and the check engine light came on with four codes and I'm not sure what to replace first. The codes are: 1) P0725 Engine speed sensor 2) P0740 Transmission control circuit malfunction 3) P0320 Ignition distributor 4) P1391 Ignition system or misfire Please give me advice if possible.
1st try and search for a vaccum leak, due to the fact that these vehicles have had some bad problems with the length of wires and hoses, if there is a vaccum leak in the vehicle somewhere that will trigger other malfunctions in your vehicle. Using a can of starting fluid or Brake cleaner spray lightly spray around our engine til you hear the motor rev-up and the spot you have sprayed will determine where your vaccum leak will be. And then check under your distributor cap for any moisture be sure to take a rag and wipe and residue off. Also check the firing order on your distributor.
Mine did the same thing,replace the tps sensor 33 bucks or so that will take care of the rough idle,I still getp0740 code and cant find any help about it.
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