Originally Posted by nperetz
Can't this all be the result of a faulty throttle body? It does look like a good cleanup mitigates the problem for some time.
Maybe the MAP sensor is just reacting to the changes caused by the TB?
Why would the sensor for measuring manifold pressure be going out of range or rapidly fluctuating with no change in the throttle or engine speed? Are you suggesting the throttle body is rapidly changing position with no input from the PCM computer and somehow cleaning it stops it from doing this for a few days?