94 5.7L (350 cid) runs till warm then spits carbon and stalls (flooded)

The car: '94 Caprice Classic 5.7L / 350 cid MPFI
It runs great until it gets warm then it spits gobs of carbon out the exhaust and starts sputtering and
stalls (flooded). forget going anywhere then :(
Gobs of carb cleaner. Checked several fuses. New Plugs and wires. New Mass Air Flow sensor. Many large tears.
Any ideas guys?
John
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if it suddenly goes rich when it reaches operating temp (warm - i.e. closed loop operation) then it's likely the o2 sensor is faulty, since it is used as a measurement of lean/rich condition only when the car reaches operating temperature.
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