Car runs great starts up fine and I let it warm up tell its at operating temperature. I drive the car for about 30 to 40 minutes and the oil light comes on very faintly, it doesnt flash or come on bright? i have checked the oil before and after it warms up and it is with in spec. My issue is after running it hard for the specified time and I turn the car off to go get gas or whatever and come back the car doesnt want to start. I push on the gas and the RPM’s dont move above 500. It is slugish and idles ruff. What could the cause be? any advice would really be appreciated.