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Surging and stalling in Park or in Drive

(1990 Pontiac Grand Am)
in Bayville, NJ on March 12, 2011
My car is actually a 1987 Pontiac 6000 LE. I was told it could be one of the following: Throttle Positioning Sensor, EGR, or Oxygen Sensor. Which one is most likely to cause this problem?
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try map sensor
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try map sensor
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