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I bought a 2005 nissan murano from a used car dealer. There is a pinging sound coming from the engine, when you start to accelrate a little bit. Once you speed up its gone. The nissan service department said to fill it up twice with high test gas and use the fuel cleaner stuff.
If that doesn't solve it, the service manager will send me to the Nissan Service dept.
Does anyone know what it could be