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I've read about 1 bazillion posts on rough idle but haven't been able to resolve mine. It started about a month ago and has gotten progressively worse. Symptoms: Idles smooth at 700-1000rpm while in park, a/c off. Turn on the a/c, idle drops slightly (that's normal) then gets erratic. It...

I've read about 1 bazillion posts on rough idle but haven't been able to resolve mine. It started about a month ago and has gotten progressively worse. Symptoms: Idles smooth at ~600rpm in park, a/c off. Turn on the a/c, idle drops slightly (that's normal) then gets erratic. It never goes...