Q&A

 Master

Generally speaking, the most common cause for engine misfires are the spark plugs, spark plug wires, and ignition coils. That being said, I would recommend you have the misfire codes thoroughly diagnosed on your 2004 Dodge Dakota before replacing any parts. If your engine is currently running poorly due to a misfire a qualified technician should be able to pinpoint the cause fairly quickly.

 Master

Common Problems that Trigger Misfire
Worn out Spark Plugs Ignition Wires, Coil(s), Distributor Cap and Rotor (when applicable)
Incorrect Ignition Timing
Vacuum Leak(s)
Low or Weak Fuel Pressure
Improperly functioning EGR System
Defective Mass Air Flow Sensor
Defective Crankshaft and/or Camshaft Sensor
Defective Throttle Position Sensor
Mechanical Engine Problems i.e Low Compression, Leaking Head Gasket(s) or Valve Problems

Common Misdiagnosis:
Fuel Injectors
Oxygen Sensor(s)
Power Train/Drive Train problems

I had the same thing happen to me in 2007...brought it to the dealership and it ended up being the valves were out of tolerance on that right cylinder head. They had to tear the entire top 1/2 of the motor apart (under warranty) to replace the right cylinder head. For a while I only had a very rough idle, then it finally tripped the engine light, when they pulled the code it said misfire on #3.