I have a 2008 Note 1.6 Auto. Great little car but now has a problem. It starts great but after 15 minutes of smooth driving, it starts holding back (stuttering) around 2000 rpm. It's not constant but extremely annoying. T preed around 60mph this problem is barely noticeable. Our local mechanic suggests a blocked fuel filter but I cant see this as being the cause....why doesn't the problem occur straight from the off. Reading up on the web it seems that the possible problem would be the coil pack. I know nothing much about cars so would appreciate some advice. BTW the mechanic is local and has a good reputation.