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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
If it just started, more than likey its the cooler air causing you to run richer, however, a good tune up (oil change, air filter change, spark plug change, injector cleaner, reset of the pcm) wouldn't hurt.