idling

I have had several chevrolet tahoes since 1998. Due to the economy crash, we lost our 2005 chevy tahoe. In 2014 we bought a 2001 Chevy suburban. It now has 204000 miles on it, and it has started acting weird. First we thought it was the battery, so we bought a new one. Put that in. Well...

I have an 2002 chevy Tahoe and have a sixth cylinder misfire ONLY when my truck idles for a long period of time. I have replaced the sixth cylinder coil pack, all spark plug wires all spark plugs. Next I'll be replacing fuel injectors. If anyone has any other ideas.. PLEASE HELP! Thanks