08 5.7 Tundra Misfiring!

I have an 08 5.7 tundra that I purchased a few months ago that's recently been throwing a lot of misfire codes. The codes will come up for any number of cylinders (it's never been a consistent set, or I'll just get a misfire for all 8 cylinders), and I'll have a flashing 4LO, a flashing VSC, and a solid CEL and Traction control light. I can clear the codes and all of those lights will disappear, but will come back after a short drive. The truck appears to be running and driving great from what myself and others can tell, and there's no roughness to the idle, so it might just be a very mild misfire. I thought I'd chase down the problem, and I now have new spark plugs and coil packs, but have had no luck fixing my problem. I'm starting to suspect fuel- either a fuel pressure regulator or possibly fuel pump. Any ideas? All help greatly appreciated!

 

What were the codes that were thrown?

 

P0300, P0301... and so on up to P0308. It'll throw a few at first once codes start coming up, and eventually it's all of them.

 

I know It’s the same old story, but I would first start off by checking all of the grounds.

 

Does is do it if the engine is cold and warm?

Is it a Flex Fuel truck?

 

It does it whenever it feels like it it seems. And no, it's not flex fuel.