My Volvo S70 T5 idles loudly and I am wondering if there is anything wrong with the aforementioned car. The aforementioned car recently had it's original head gasket replaced with a new head gasket and two valves were burnt out so the aforementioned valves were machined. So is anything wrong with the aforementioned car? If so, I have warranty on the engine work so I could ask my mechanic to fix the problem with the car, if any. Is there anything I could do to fix the problem with the car, if any?

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Don't understand what you mean by idles loudly? Motor, exhaust, reving?

Also, if you recently had work done on the motor, simply take it back to your mechanic and have them fix it.