My 92 jeep yj has been acting weird for the last 6 months. I can drive it for about 30-45 minutes and it starts sputtering and losing acceleration. If I put in the clutch while it is doing this it acts fine. But when I let off it continues. I have to pull over and cut it off for about 10 minutes and I can drive for another 30 minutes until it happens again. I have replaced rotar, distributor cap, plugs, wires, fuel filter, and I have also put sea foam in the tank. But it still continues. My temp stays around 210 so I don't think it has anything to do with thermostat. If anyone has any advise please help.