If you look at my post my car is a 91 integra and is doing the same thing. I too replaced the distbuter the fuel filter wires and plugs but no help. It will run ok for a while and then start to studder in the lower rpms. Some times it will not start and other time it will. I have got no responce on this site. I thought someone would have some ideas.
I feel its ELE.. Reading some post it could be the fuel relay. I really don't know. Unlike you I am trying to sell mine, but to no avail. As soon as people hear the motor I can't give it away.

I will watch your post and see if anybody can help. At this point I think this problem has them stumped.