Howdy all, Just wondering if what i'm experiencing is piston slap on my LS1. First thing on a cold morning on my way to work, I take off gently and am presented with a wierd vibration noise from the front of the engine. I don't hear the noise when at idle, when the car has warmed up, or when the car is in neutral (and accelerating to the same revs), only under load when i'm actually driving (when the engine is cold). I have had a lack of power and a rough idle of late, is it a possibility that i've dropped a cylinder due to a dead spark plug lead or coil pack or are my injector/s shot? Or is it the worse case scenario...Piston slap? Thanks in advance, Boojakz.