Hello, I have a 2012 A4 2.0T. It’s a 6 speed. I’ve noticed that under a very low RPM load there is a faint rumble, almost knock sound, coming from my motor. This only happens in gear. I can be in neutral and never hear it. It only does it until I get up to speed and build boost. I’m not sure if this is normal or not, but I just don’t know a whole lot about these 2.0’s. I just replaced the PCV valve, and I’m not sure if maybe a bad coil pack would create this, or maybe if one isn’t fully connected, or something of that nature. Just looking for some answers on this topic. I’m also about due for a transmission fluid change, but The sound just doesn’t seem like something that would be coming from the tranny. Thank you