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Valve Spring came off
I had the same problem. What you are describing is the same problems I had 30 seconds while my valve spring was jumping around in the #7 cylinder. The spring for me unfortunately jammed up in the piston and ruined the engine. My car has 53k Miles on it with a LS3 engine.
I wouldn't be turning it on, if I were you. You probably have the same issue. If you have the same problem you will be out at best new valves, head, and piston. Rebuild is around $4500.
Good luck, I will be rebuilding my powertrain with a LS7.
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