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Rough Idle, Nearly Stalls accelerating from idle & inclines - very rough accel

(2003 Ford Crown Victoria)
in Dubuque, IA on August 19, 2014
My '03 Crown Victoria LX SPORT began idling very rough whenever stopped in traffic while in gear. Even more alarming to me, is the fact that it almost stalls completely when accelerating from idle (stop lights, stop signs, traffic congestion) and while accelerating up inclines. Today, immediately upon starting the car, the radiator cooling fan begins to run VERY fast and VERY loud. The longer my car idles (in park) the faster and more loudly the fan spins. This continues to happen even after turning the car off and allowing some time until starting again. All 3 problems are very concerning since my beloved Crown Vic has never made a single bump, thump, chitter, chatter, and/or hesitated in any way. The thermostat always reads exactly the middle. No check engine or warning lights/alarms of any kind. I would greatly appreciate any insight anyone has to offer. Thank you.
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