'03 Civic SI intermittant starting problem

Over the past few months I have had this problem happen a few times. When I go to start my car it turns over no problem and all the lights are on but it doesn't start, if I try a couple more times it will start but is a little rough for a few seconds. I brought it to Honda and they can't find any problem with it.. they suggested I change the air filter which I did, can anyone help me? :uhoh: