Engine dies at idol

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I have a 2012 Wrangler Sahara, ever since I had the head replaced by the dealer, it will die at idle in gear….usually at a stop light. Seems to happen more when AC is on. Dealer can’t figure it out…. dies sometimes in reverse or if I max out power steering.
Diagnostics says the idle control valve ( not sure if right name) is working and increasing rpm’ under load….. any suggestions?

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Article source: http://www.wranglerforum.com/f202/engine-dies-at-idol-2019625.html