Originally Posted by brandons02
What type of plugs did you use, also check and make sure you didnt cross you plug wires. Not sure but if the plugs look really white that means your running lean. you could unplug your wires one by one and see which one changes how the engine runs, normally if you unplug a wire and nothing changes that plug or wire could be bad.
It's pretty much impossible to cross the plug wires on an LS1 - the coil packs are directly above each spark plug. If the wires were crossed, you'd evidently see it - they should go straight down from the coil pack to the plug.
I'd check to make sure all the plugs are screwed in snugly and that the wires are all the way on the plugs. They can be a real bitch to get on sometimes, if they don't "snap" on, they usually aren't on all the way. I'd just pull them all off and re-install them, making sure each one snaps onthe the coil pack as well as the plug.