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change timing belt and water pump. car cranks and runs fine except for a engine vibration. No loss of power or hesitation just noticed a difference in the vehicle. fuel mileage got better after changing these components. got code p0300 today after 140 miles of driving. type of vehicle is 2005 Chrysler 300

Vehicle: chrysler 300 limited

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P0300 Random misfire

Check the sparkplug condition , and note any difference among the other sparkplug condition, if you do decide to replace the sparkplugs, you need to use what is required, the Chysler 300 depending on the engine size require a champion sparkplug it would be listed in the underhood sticker for the part number. One of the worse offender for a P0300 when it comes to the 300 is carbon build up. There is even a TSB about P0300 TSB # 09-010-06. Due a top engine cleaning which will help decarbonize the combustion chamber.

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