Valid points about he AMM and the "air", but if its not the AMM and i'm pretty sure that there is nothing wrong with the turbo (no smoke, and no boost lost) then why all of a sudden is the car not driving normally?

Let me describe the symptoms as best i can..

1)Hard to start (lots of cranking)

2)dies occasionally at idle

3)Very difficult to get RPMs above 1500 when driving (once it does get above everything is fine, boost, shifting, sounds, everything, but once the RPMs drop below 1500 the problems recycle)

4)Excessive hesitation

5) When problems occour the RPMs jump between 1000 and 1500 at it's own will

6)These problems don't always happen the first few miles of driving (car drives fine) but will always occur at some point in the same trip and from that point will sometimes go away or never leave

John