i dont think injectors are the problem mooshie is having.
In the first post he states that

Quote Originally Posted by mooshie View Post
The car ins't stalling at all and it starts fine, just a very slight misfire on very light throttle like cruising on a flat road. Speed makes no difference and it is fine when I apply a heavier load to the engine such as going up a hill or accelerating, seems to be worse on a hot day and it doesn't happen when the engine is cold, although my engine warms up very quickly compared to stock due to the turbo.
if it was a fueling injector problem at very light throttle the oxygen sensor would make the correction and it would behave the same at wide open throttle as it would be lean.

maybe the problem is with tuning of his Autronic SM4.