RE: The Mark won't idle
If the stealership charges you less than $200 to change it. GO FOR IT! I've heard nothing but horror stories about it. It is located behind the engine. I believe my manual suggests to remove the right wiper motor to get better access to it. Obviously you'll also have to remove the air tube. But the dealership might have it listed at only 1 hr labor, so it doesn't hurt to call ahead and ask them what the "book" tells them.