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Hello, my name is***** engine do you have? Is the check engine light on? Thanks.
P2112 is related to the throttle body which could also cause the idle problem. Start by cleaning out throttle body with cleaner from parts store and a rag. Spray cleaner onto rag then wipe out throttle bore. If problem still exists replace the throttle body assembly. Let me know if you have more questions or if there is anything else I can do to help. Thanks.