Mine has 181's in it from the factory and it has the stumble in it, funny thing is I'm thinking now that I might have a bad DV, the reason I say that is I had a slight stumble before the injectors if you were in just the right parameter and it was almost unnoticeable but if you were sitting at idle and brought the RPM's up to 1200-1300 it felt like something was out of balance ever so slightly, now of course it is more definite. I have played with the Governor springs enough now that I have ruled them out of the equation.
Jim