When my car is in drive and I’m idling at a stop light, my engine shakes and kind of sputters. It seems like its idling low (about 600rpm). It keeps on shaking and sputtering until I start driving at higher speeds (about 40mph+) then it goes away. I just changed the front and rear motor mounts along with the spark plugs and wires. Any idea what could be causing it?
Sounds like an engine misfire. If the check engine light is on, of course go ahead and pull the codes and post them below. It is possible that one of the fuel injectors is sticking. When you pulled the spark plugs did you notice one of them looking a bit darker or different than the others? This may be an indication of the effected cylinder to concentrate on. If you find an effected cylinder you can swap parts around to see if the issue follows that part or not.