I had a bad front motor mount, so I changed it, there is still a loud banging noise coming from under the car. It only happens while accelerating, an not in 1st gear, but second, and third, and so on. If I push in the clutch, and take it out of gear, no noise, no banging. I can accelerate through it, and it seems to get quieter. I can also kind of drive easy, and it seems to almost not happen. I've changed both front and rear motor mounts, and nothing...I'm lost. I hope it's nothing seriously bad. Has anyone experienced anything like this?