When my car sits at idle for more than a couple minutes the check engine light and DSC light comes on and the car then starts idling rough. When I check the check engine light it says misfire in cylinder 4 but after turning the car off and back on the DSC light is off and it idles fine as long as im in motion and not sitting at idle for more than a couple minutes. What could be causing this? I have changed the plugs, wires, coil pack and valve cover gasket but it still does it.
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Code P0304 – Multiple Misfire Detected on cylinder #4
Leaking, sticking, stuck open and or clogged fuel injector.
After if starts to sputter for a while, pull the plug and see if it is wet or dry.
Spark plug Diagnostic Chart
You can swap the #4 cylinder fuel injector with another cylinder and see if the problem follows the injector(where ever you installed the #4 injector you took out). If the next code comes up to whee you moved the injector… Replace that injector.
post back your findings in the comments below.