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Ive changed spark plug,coil and injector to cylinder 4. Still misfiring, round rough and checked engine light is on. Need guidance to fix the issue

Vehicle: 2006 Chrysler Pacifica

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Hi there

Next check for an intake manifold leak. Spray some carb cleaner along the intake with the engine running. If the idle smooths out, then there is a leak causing the misfire. If there isn't any change then do a compression test to see if there is something wrong with the inside of the engine

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