[Ron61]

You only started having this problem after the dyno tune if I am reading this correctly. Is this the first time you have gone through having it tuned and then set back after the smog check? If so, then I am guessing you never had any problems before after they set it back for maximum performance. Is your fuel pump mounted on the left side or near the center of the tank? It is possible, but not likely that it could have a little crap in the filter and on right turns not pull enough fuel into the lines to keep the car running for a while. If you have a fuel pressure gage watch it and see what it does.

Ron