And actually, they don't tickover too well either. Most of the stag systems have a slight hunt, of varying degrees on the v engines. No biggy, but its there.
There speaketh a man with the inferior 3.2. No idle issues whatsoever on the superior 3.0l engine, despite running so rich at idle the trims get hard pinned so hard, they never recover 
The 3.0 with the old black single feed vap, older injectors and single hole tank with older stag kit that lags, you mean.
Bit of hunting or lag. I'll have the hunting thanks. Or eventual hunting, to be more accurate. Its nout go do with the car. I had your kit on my other 3.2 don't forget. 
Yeah, I reckon its the evap causing that lag. Its fine with a lot of gas in the tank, but occasionally lags with lower gas levels - wonder if thats why you noticed it more on your old one (due to small tank)?
But my point I was trying to make is the superior 3.0l auto doesn't lag in the same way the inferior 3.2l auto does (on petrol).