1997 GMC 5.7L Rough Idle-Help

Hello, I have a 1997 GMC Sierra with a 5.7L Vortec. I've changed the plugs with Boush Platium 4's, AC Delco Wires, Cap and Rotor, PCV Valve, fuel filter, fuel pump and sending unit and I still get a little rought idle if I am stopped at a traffic light. Does any one have any idea what is causing this. The truck is very well maintained, synthetic oil changes evey three months, never worked and its bugging the heck out of me!!!! Thanks.

Dcammata,

For your info: Last August 2003, I also noticed my 1992 GMC a little rought idle so I took it to the garage and the replaced both motor support and the transmission support. When i got the truck back, it was just as smooth as a brand new virgin truck.

Problem Solved......the truck needed a fuel system cleaning........runs like a brand new truck. Thanks for the info Titanic.

Domenic

Great to hear that...!!!

I forgot the Injectors :banghead:

Problem Solved......the truck needed a fuel system cleaning........runs like a brand new truck. Thanks for the info Titanic.

Domenic