low idle sometimes at stop

[greenhemi]

have 2011 quadcab, 5200miles. has problem with low idle, 500rpm, at stop. if a/c compressor on them will be 750rpm at stop.

[Tbird100636]

have 2011 quadcab, 5200miles. has problem with low idle, 500rpm, at stop. if a/c compressor on them will be 750rpm at stop.
Some HEMI's, especially in trucks, will idle at 500 rpm when at operating temperature. The engine will not stall, and should idle smoothly.