Drivers of 2006-07 Ford Freestars and Mercury Montereys may come into your store complaining of a popping sound from the engine compartment at idle. Once you have the hood open, you'll probably notice ...

Q:I have a 2001 GMC Sierra with the 5.3-liter engine. After I park the truck in the garage and shut it off, I hear a "pop" noise about 10 or 15 minutes later. It's a loud noise and I can hear it ...