I just got a vehicle from a trade here on RCU and I fire it up and it sounds really weird to me at idle. Its really hard to explain but there's a sound clip of it. I know some stuff about Nitros but I have never heard an engine run weird like this. Any help would be appreciated. Lol almost sounds like a helicopter.

[link=http://media.putfile.com/Losi-Truck]Sound Here[/link]