Ok this is my first fairly new vehicle. My previous and my first vehicle was a 1992 Honda Civic and I could feel the engine when I idle or even when driving.

I recently bought a 2004 Xterra with 44,000 miles and it's pretty quiet but when it idles at a stop sign I can feel the engine a little. Just a slight vibration that I feel in my legs. Is this normal or should I not be feeling anything at all? I had 93 gas in it so I don't know if that could be the reason. The dealer also had to change the knock sensor because the scanner came out with a code.