so ive had my car sit for a few days in my garage because its been snowing like no other lately. all the snow is melted away now. i got in my car and let it warm up for about 15 minutes then i got in it, put it in reverse and heard a loud pop. i checked to see if i ran over anything but there wasnt anything in the way of my tires. then when i was driving i put it in 3rd going about 40 just for the hell of it and then it started sputtering. it drives fine now but will it happen again? and any idea what it is?