I have a 2000 s2000 and while driving home from a 400 mile trip the car began acting like it was running out of fuel. let off the pedal and apply again and it would start running again for a few minutes and then would just fall on its face again. It is now doing this all the time and acts like it is runing out of fuel. Car has half tank of gas and oil level is good. No lights on the dash and no smoke. Any ideas?