Sounds very similar to what mine is doing to. I have had several threads. Mine won't do this unless I put it under a load.... I can sit in my drive way in park and rev it to 5 grand all day and it won't miss once. Soon as I put it in drive and as you said stomp the pedal I get the popping and spuddering. My engine light does always flash however, and it goes away sometimes and goes ahead and does what its suppose to. I to have had my plugs replaced or at least I am pretty sure they are. I've gotten lean codes and mis fires on bank 2.

I am leaning towards either the cats stopped up on mine, or the intake gasket leaks around the two cylinders that have miss fired. I am gonna take mine in and I guess fork out the 90 bucks to get it diagnosed completely and find out EXACTLY what the issue is.