Why is car surging rpms in idle when in drive but full brake applied?

2005 FORD TAURUS
100,000 MILES
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JWOOD78
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My mothers 2005 Ford Taurus is surging while in idle at stop signs and red lights and a few times has completely cut off. We have replaced Idle Control Sensor, plugs n wires and air filter with still no success. What else could it be?
Oct 15, 2012 at 3:40 PM
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HMAC300
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scan for codes , check fuel pressure and clean tthottle plate on both sides they get gummy
Oct 15, 2012 at 4:37 PM
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JWOOD78
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No codes come back when diagnostic is ran. I replaced idle control valve, plugs and wires and air filter but haven't cleaned throttle plate or checked fuel pressure. Thanks for the info
Oct 15, 2012 at 5:33 PM