I have this really weird problem with my idle, it doesnt always do it, but 40% of the time lets say im at a red light, my car is idling and im in first gear but i have my foot all the way down on the clutch, and my idle messes up really bad, it goes from a 1000 to 200, it always goes up and down and sometimes it stalls coz of low rpm.. if i but it in neutral, my idle is perfect, it idles around 1000 rpm, but as soon as i but it in gear, my idle starts ******* up....does someone know what it is?

 

Clutch switch - not an uncommon problem. Get a new one, it's pretty easy to swap out.

Dale