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Can you post a video of the idle?
My old blue Lincoln (once again. lol) idled like it had an E303 or TFS stage 1 cam when I bought it, but cleared up with throttle input, just like your Mustang. It had a slight rumpity-rump to it. It turned out to be a torn vacuum line, the one that hooks up to the M.A.P. sensor.
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'99 Crown Victoria
'97 Impreza 2.2, 5-speed
'98 Impreza Outback Sport 2.2, 5-speed
'05 Outback 3.0R (wife's)
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