Ok well firstly hi everyone, I am new here and pretty impressed with some of the projects etc. I am a Ford tech myself and this is my first VW and its a TURBO!

I bought the car last weekend and love it, however, when I got it back it felt like it had a very slight hesitation, I was advised from the guys at work to clean the throttle body out which I done, will I need to get the values reset on VAGcom?
Also, it has now developed what I beleive to me a missfire, I have changed the plugs with no availl. Will I need to get this plugged in and see what (if any) cylinder is missfiring? I am going to unplug the MAP sensor and see if this does anything. If a coil is down, would it cause the car to boost below 5psi as thats what it does at the moment?
All help appreciated, thanks!