weeks ago I saw a post from Greg that some Z's need a richer mixture for a perfect idle. I tuned my idle afr down to 14 from the normal 14.7 and that got rid of the miss after trying just about everything. I had been fighting this miss forever. Now if only I didn't start losing fuel pressure causing me to go lean again after I warm up I could enjoy that smooth idle...
Also mentioned in the post by Greg was to try disconnecting your o2's and see if it goes away. I believe this worked for BigTDogg and I believe a more permanent solution was offered.