So I drove from my lawyer's office to my home no issues. Started my car to drive back had a slightly rough idle but I just thought it might be a gas issue and was going to throw some gas treatment in the tank then top off with some other gas after I went back to my lawyer. Went to my lawyer's office came back to my car and it wouldn't start. Called my mechanic and he said it sounds like a battery issue. Replaced the battery and the car still wont fire up. Any ideas?