I dont have the original Fault Code and I have thrown the old MAF Sensor.
Before replacing the MAF Sensor, it was mimmicking what happens when my MAF sensor is unplugged, it would have a huge delay from pressing the pedal to the Revs responding. That is now ok since the Sensor was replaced.

When I rev the car in neutral it takes a long time for the needle to find its way back down, really does drop slowly

My XFire is the N/A yes, finding an SRT over here is rare!

I wonder if its something as simple as the 'O Ring' on the TB is buggered and now air is escaping / sucking in.
I have ordered another Throttle Body so waiting for that to be delivered.

MB Specialist garages dont seem to be common around my area either, just my luck lol
Will keep trying things and posting the results