IT doesn't seem to change when in neutral, I had that thought too. I don't have any maintenance record, and I just got the car about a month ago. It's happened since I've owned it. I have changed both fuel filters, and put about 2.5 tanks of fuel through it. I am going to adjust the valves this week, along with hopefully getting to the bottom of my hard 1-2 shift (adjusted modulator on trans, helped some, but still some intermittent hard shifting.)

I'll write back with results from the valve adjustment. And what should I look for in a worn out motor mount?

Thanks,
Jack