Idle

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Note, some change in engine RPM's is to be expected with a load change. Examples include AC turing on or turning the steering wheel.

A low idle in response to a load change is usually a sign of poor cylinder balance (IE one or more cylinders not pulling their weight). Usually ignition related. The other key is the idle is fine otherwise.

For more information:

Is your mustang stumbling, dieing at idle or idling rough? - Page 14 - Ford Mustang Forums