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Sounds more like you bent a valve then damaged a spring, if the spring went the car would be running a **** of a lot worse, very unlikely you damaged the spring, I would say bent valve, bent valves make noise, especially at idle, and reduce compression in whatever cylinder it is hovering over thus reducing power.
 

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[/quote]

Sounds more like you bent a valve then damaged a spring, if the spring went the car would be running a **** of a lot worse, very unlikely you damaged the spring, I would say bent valve, bent valves make noise, especially at idle, and reduce compression in whatever cylinder it is hovering over thus reducing power.
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I would not check to see if you bent a valve or spring, will be a great deal of work involved and you will not be able to see the valve(s) unless you remove the entire valvetrain let alone the valve covers. If your car is still under warranty your covered for 60k anyway on powertrain crap, bring it to the dealer they will fix for no charge.
 
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