Ok my problem is sometimes I can't start the car but when I do I rev it up to about 3500rpm and let off the throttle and it stalls. When I starts it back up I have to pump the gas and stay on it. Usually it will smoke and smell like it's running really rich for a good 10 to 15 min. Then the smell of burning oil come around. I don't know why either. I just changed the oil and the oil filter like a week ago. Along with the oil and oil filter I added fuel injector cleaner and new gas. What is causing the stalling and the burning oil smell?