Hello. I have a Scion tC with approx. 37,000 miles. I have recently noticed 2 things that I'm not sure where they might originate from, but one of the problems is that when I start the car it kind of jolts abruptly. The second problem is that when the car is idle, it shakes. It's not a violent kind of shaking. It's a bit mild, but it's noticeable. From what I have been told, the problem might be the motor mounts, but I was looking for other opinions to confirm what I have been told. Thanks.