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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Not necessarily. MAP sensor reads manifold vacuum, it doesn't care that the readings just don't make any sense. So long as the PCM is getting a reading that is within the acceptable range of the sensor, it considers it Valid. Very seldom will a vacuum leak set a map code. Usually, what you find are the results of the leak setting a code, or causing a problem.