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He is correct you need to work the engine and heat it up to burn off the carbon that can and will built up on the injectors from only being driven around town. One way to heat it up is to hook up to a 5,000+ lb trailer and drive it for a 4 or more hours non stop. FYI, A diesel engine was made to work hard all day long pulling loads and not be driven as a daily driver to and from work in stop and go traffic.