I have been having issues with my car. Sometimes when I start it and put it into reverse or drive it stalls out, it also will happen when I am stopped at a light. I have to keep pressing the gas to continuously idle the car and put it in gear so it will not stall out. I notice when I go to put gas in it there is a lot of air pressure released when I take the gas cap off. Right now my car will no longer start, it first seemed like it was going to start but it wouldn't. my battery is new and I have all the fluids in the car. Can anyone help?