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It also happened to me when someone else drove my Sierra Pickup. They must have pushed emer. brake pedal down just a notch or two and engaged the switch but not the emergency brake. Took me quite a while to find it until I pulled the brake release.
Usually worn valve guide seals.Oil leaks into cylinders when parked then burns when started.
the plug gap changes to .040 from .060 with stock and platinum plugs. What are the bet plugs to use in my 6.0 liter engine?