: rough idle

09-19-11, 03:59 PM
Somewhat recently my car has developed a rough idle. It runs great anytime it's not at idle.

Always kept up with recommended maintenance etc.

Any ideas what I can look at to get the smooth idle back? It's smooth as butter above 1krpm but it wants to idle around 500rpm and it's just a little lumpy down there.

2005 V8 approaching 90k miles (mostly highway)

09-21-11, 08:42 PM
Intake manifold bolts loose?

09-22-11, 12:54 PM
I second what EChas3 said. Lots of reports here on improved idle and other things after re-torquing the intake manifold bolts.