Pontiac vibrates when idling
Today after school my Pontiac didn't start as smoothly as it normally does, and while i was idling at the traffic light it was vibrating, quite noticably. I figure it is the spark plugs, what do you all think?
Anyways i bought the spark plugs but am having a very hard time taking the plug out, i read the how-to, i tried twisting and pulling but they won't budge.
How long do i twist for, i felt as if i "unlocked" the wire when i turned them, but they still didn't come out. Btw this is a Pontiac Bonneville 2001 (not supercharged)