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Started the LS yesterday and the engine felt like it was shaking as if running on 4 cylinders; it went away after a few seconds. Today same thing, so I turned it off and restarted it - resulting in just cranking for several seconds, no start. Tried again and it finally started, but piles of smoke out the back (just like a seafoam start). It cleared up after a few seconds and was running fine after that.
Is this a bad coil pack? Distributor? Definitely felt like a whole bank of cylinders. No engine light.