My Saturn always starts when hitting the key. I normally drive it on a daily basis ,but it sat for several days as I drove my Explorer. The other day I went to start it , it will turn over strongly , but won't start. You can smell gas after several tries , so fuel pump is working . It seems it is not firing , what is the most likely cause ? I have never had an issue except starter and battery, both are under one year old. Thank you so much for any advice.