Burning Smell from Engine when parked
 

Hi All, I have a 2004 Mazda 3. The last few months I've smelled a slight burning (chemical) smell coming from under the hood. The last two weeks, the car shudders in 1st and 2nd gear, when I am accelerating.
I took the car over to get the oil changed today and the guy told me he experienced none of those things. I am concerned about getting after this issue before it gets really serious.
Your help and knowledge are greatly appreciated!

It could be the clutch.