did you find out??? I'm having the same problem
Yes, when idling and driving.
A clogged muffler can.
Sounds like the engine mounts might be failing and no longer damping engine vibration.
spark plug gap Can also be a vacuum leak.
There are a few reasons why a car shakes when idling at a red light. Some reasons could be the ignition coil, motor mounts, or spark plug problems.
Sounds like a misfire caused by electric supply to plugs.
Loose motor mounts.
Need new motor mounts..... That's what was wrong with mine.
Bad catalytic convertor. Egg smell is a dead giveaway.
Your power steering pump and or steering box may be about to give out on you.
Many things. Mine did that when my spark plugs were misfiring. Check your entire timing system starting with the spark plugs and wires. Get diagnostics done at Autozone and it will tell you immediately. i had a vacumm line off on mine