At idle, my motor is making a ticking sound. It's coming from inside the motor. I just finished installing the motor (with turbo) a month ago, and I've put about 1100 miles on it. It just started the other day. When I give it gas in neutral, the ticking seems to fade away as the revs increase past 3000rpm. Is this a mild knock or just a natural sound that i shouldn't worry about. It doesn't make the noise while I'm driving.