While it’s normal for a car to be idling high when it’s first started, if the idle doesn’t drop to normal after a minute or two, something’s probably wrong. That initial temporary high idle, which is ...

Q: I have a 2006 Chevy Cobalt LS, 2.2-liter engine with a manual transmission. It has 186,000 miles and is a very good commuting vehicle. Recently it was idling rough and I read that cleaning the ...