About a week ago I started noticing that while I am driving in any gear, theres a sort of crackling noise coming from the engine. Even when I'm in neutral and give it some gas I can hear it. But it goes away when I'm stopped or if I'm out of gear cruising in neutral. It might not be anything too serious and my new engine is almost built so I'm swapping it in a week anyways. Just wondering if anyone might have experienced a similar problem. I just recently had my crank pulley and all belts replaced on this engine if that might give any clues.