So this brand new car with 500 miles on it now. Each time I have filled up, the car stalls out and runs rough intermittently while at red lights and while driving. I have filled up for the 3rd time and it consistantly only does this when the tank is full. Once I have used about a gallon it runs and drives with no issues. I dont think its in ship mode because everything works as it should. Any Ideas?? Thanks in advance.