Go to the HP tuners repository and download any stock l29 files. All the ones I've looked at have misfire disabled. Seen it was disabled on my truck and I thought maybe someone had been in the tune before, so I began to look and see what if anything was different than a stock tune. Mine was in fact stock, or at least everything was exactly the same as all the other l29 stock bins I looked at.
Point is, if they have that disabled stock, how smooth can you expect to get it?
Min has a little sort of hiccup type misfire at idle, seems to be resolved somewhat by raising the idle. At least not as bad at 700 rpm as it is at 600.