Ok so I got this 3.3 used. It runs pretty good on highspeed. It idles ok once ran a little bit I have tried turning the LSN all kinds of ways. It's running rich on the bottom end. And I can't get it to lean out enough. If you let it idle a bit them try taking off it bogs till it burns up all the excess fuel then it's great on top end and semi good on bottom end. I know it's rich because just putting around till it dies. The muffler fills will fuel.