need to replace the intake manifold gasket
did you find out??? I'm having the same problem
A clogged muffler can.
Yes, when idling and driving.
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.
Loose motor mounts.
Sounds like a misfire caused by electric supply to plugs.
Need new motor mounts..... That's what was wrong with mine.
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
"Noisy" because the engine is vibrating more than normal? Low idle will cause the engine to shake. Low idle can be caused by - Dirty/clogged/sticking EGR valve - Vacuum leak or air intake leak - Dirty MAF sensor
Bad catalytic convertor. Egg smell is a dead giveaway.