Lately after my car warms up I notice the idle is a bit rough to where I can feel it in the driver seat and the stick shift sort of wobbles, car is a 2000 GT w/ 60k miles , all stock, Ive been using 92 octane gas since I bought it 1.5 months ago, also when I'm at a stoplight sometimes ill notice the idle speed drops to nearly nothing for a brief period (2-3 seconds) then it goes back up to a normal idle, and for the first time today it actually died when at a stop light ,it fired right back up tho .. any idea what I might look at? The check engine light hasn't came on at all (yet). The car feels normal performance wise when im actually driving except for maybe a slight hesitation on take off, Thanks.