hmmm. is there anything that leads up to it? heat? high humidity? rain perhaps? it seems to me like it's misfiring and running on 3 cylinders. thts what happened to my sol. my distributor basically threw a fit and died, and the result was similar to your problem. try cleaning your plugs, check the plug wires @ both ends for loose connectionsor moisture inside. i recently got H2O in a plug boot, which cause a lot of trouble