I am not saying that is the problem, but considering the ECM was logging a MAP sensor error it could have been a bad sensor, or it could have been an actual manifold pressure issue like a wastegate problem or similar. However, if the turbo is spooling smoothly and within acceptable range, then it is likely okay.
Moving on, have you checked for vacuum system leaks with a vacuum check? I just noticed your comment about replacing vacuum lines at the throttle body. If they were in poor shape, it is likely many of the other vacuum lines are in similar condition. Vacuum leaks can present serious issues for turbocharged engines.
Curious, do have the ability to take a short clip of the problem, say with a digital camera or cameraphone? It can be a huge help if we can hear and see the problem.