I am experiencing the same problem with my 95 GSR. So far I've assumed it to be an electrical problem (based on a similar experience with another vehicle). As such, I first filed the points of the distributor, filed and cleaned the rotor, and regapped the plugs. None of these solved the problem. I then replaced the ignition wires and that greatly lessened the problem but didn't eliminated it completely. I suspect that maybe an insulation breakdown of the distributor cap may also be a contributor to the problem. I plan to pick some dark evening to view engine while its running to examine the possibility of electrical leakage. Will let you know when I've completely solved the problem.