i think i am having a similar problem. if my car hasn't been driven overnight or something, it will start right up but run really rough. the idle will usually sit pretty low unless i hold it at a higher rpm for like 30 seconds, at which point it'll start to even out a bit. But if i drive somewhere and shut the car off for even just a few minutes, there's a good chance that it won't start back up. It just turns over like it wants to start. I usually have to a wait a while and then try some more while pushing the gas pedal down and then it will eventually start up but continue to run rough. Any ideas?