Alright on my drive home tonight from work tonight, I decided to get on it a bit. As I was doing this, it would jerk slightly every one and a while, nothing major but you could definately feel it. Does this sound like a spark plug issue? I replaced them 8 months ago in april, but the car does run pretty rich as it is un tuned.

 

I would pull one just to check the condition of it. I had a simular problem, only my car is na. I pulled a plug only to discover that it was badly carbonized.