OK. during the traffic jam/bumper to bumper, there is no over heat, but when I was driving 80-85 mph.  the water temp gage stayed closed 75%, way past the middle line, say 200 degree. Secondaly, when I was in the bumper to bumber/stop and go, the car did not have smooth start.  When I depressed  accelaration pedal, the engine stumble/hesitate.  Once the car got over 2000rpm,  I don't feel nor it(carb or cam?) does not ocuur the stumble/hesitation. Oh well, I spend soo many hours yesterady on the previous thread discussed  gas fume in the car.  I got an idea that  I will replace the gas tank vent hose or plug the vapor vent lines which Rick Salia did past month. Excuse me my grammer, just like z, I am from Japan.