After my car's been driven for awhile, like a full day, it starts to run kinda of rough on starts. It'll take awhile to start at times, but others will start right up. It'll also stall out at times, but others idle flawlessly. Another problem it seems to have is what sounds like a misfire if I'm idling and I just spike the gas while sitting there. Things that have been replaced since owning the car are cap/rotor, ignition coil, O2 sensors, and that's really all that would make any kind of difference I believe. Any suggestions? Would this be a distributor related problem, like maybe the stator is getting too hot or something??