Well, it could be the Idle air control valve sticking. Over time, carbon builds up in the idle air control valve and causes the valve to have poor/erratic operation and eventually it will stick in one position. I have pulled mine apart, replaced the rubber o-ring and cleaned out the inside with carb cleaner and it worked wonders. It's real easy to pull it apart and the cost of the gasket and o-ring is easily under $5 so it's worth a try even if it's not the cause because they tend to clog up anyway.
Keep us posted,
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem 
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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