I installed a 52mm thottle body and now my car want to stutter sometimes and at idle it is almost not getting enbought air when in drive at idle and then when i put it in nutral it sucks in a bunch of air and goes back to being normal untill i put it back in drive and then when i'm just rollin it does the same thing again, does anyone have any ides what it could be?

 

make sure you have installed all the gaskets. 3 of them counting the plate gaskets. You might need to come down on your idle screw too.