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It an air port on your intake manifold. What happens is over time the ports get clogged with sludge and get stuck open. You have one of 2 options.
1. You could remove the manifold and clean the air ports themselves. (Doesn't guarantee the CEL will go off though.) The IMRC is computer controlled by your PCM and there isn't anything you can buy to reprogram the computer yourself.
2. Take the vehicle to the dealer. The dealership has the software to reprogram your PCM to open and close again. That will fix your problem and turn off the CEL.
check the clips where the linkage from the imrc goes to the actual runners on the back of the intake, most often they break the small retaining clips that hold the rods in.
the pcm update for the imrc concern changes pcm strategy to cycle the runners open and closed on a decel to make them move a little more often and help keep them from sticking. some people that drive easy dont get them to open that often then when they do they stick. A fuel induction service will also help clean the butterflies