Well the passed few days when I get up to leave, the car starts up fine most of the time but by the time I back out the drive and get to the end of my road, the car dies when I start to slow down to stop. It has done that a few times. But this morning it actually stumbled and acted like it wanted to die so I revved it a little and it just didnt sound quite right. So as I was backing down the drive it was stumbling more and just running rough. So I revved it more as I coasted out the drive. Then I took off down the road wanting to get it revving and it seemed to be fine but before I got to the end of my road after I had let off the gas it started to not sound right again, like it wanted to start running rough again. I think it was just since its started getting a little chilly outside that this started if that helps. What is wrong?