Last picture in the first post of
this guide you can see where the map sensor is and how he ties it down.
The seal around the
Manifold
Air
Pressure sensor can sometimes wear away, breaking the vacuum inside the manifold, this can cause loss of performance, I think due to false sensor readings.
Securing it with either a cable tie or some gasket sealant in a lot of peoples cases quite significantly increases performance (I say increase, but it's just returning it to how it should be).
Hope this helps