Shaking

[afd133]

I have a 2000 Silverado 2500 with the 6.0. When the truck sits at an idle, it shakes. The shaking gets worse, the warmer the truck gets. It feels as if it has a misfire, but doesn't. The check engine light never comes on for a scanner to pick it up, and luckily it never stalls. The shaking is also accompanied by a loss of power, but i'm unaware if the two are relative to each other. I have had multiple combinations of plugs and wires trying to solve the problem, with no relief. Anyone with input?

[Shaners]

I would start with a good cleaning of the Throttle Body.