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I have a 2000 Dodge Dakota and has a 3.9. It's giving a p 304 code. Runs really really rough. valves rattle and everything. put seafoam cleaner through it ran it down the road and has stopped. Had the

Wires, plugs, rotor button, distributor cap, had injectors looked at they where fine.

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DTC P0304: Cylinder 4 misfire detected. Probable cause:
1. Check for latest control unit software update
2. Faulty PCM or ECM
3. Fuel injector(s) faulty
4. Ignition system fault. Check ignition module, coil, spark plugs, and wires
5. Fuel system

Posted on Dec 09, 2014

Testimonial: "PCM, ECM?"

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Posted on Jan 02, 2017

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1 Answer

Runs rough right after starting. runs rough for about 20 seconds and then runs fine after that.


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Did you properly gap the plugs when you changed them? Improper spark will cause really rough idling at low RPM like that.

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