When ever your using fans, heat or air It requires more power to operated through system, more demand on engine. If has been idling rough, the a/c has nothing to do with the rough idle problem so much, as it just puts more demand on engine, to lower idle, I would check have fuel injection cleaned, possibly air filter and oxygen sensor replaced. Let me know, if this has helped. Thanks mike from fixya.com
Sounds like possibly you might need a new O2 sensor. Have it checked out
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