maybe but it could also be your flex tube which absorbs most of the vibration. If it is cracked or broken than you will feel a lot more vibration because it is no longer being absorbed.
no
it's possible
IAC (Idel Air Control Valve)
water in the fuel can cause an idling motor to sputter and/or die.
Muscle spasms can cause this.
my 1990 300zx is idling rough what could cause this?
Replace the Idle Air Control Valve only about $50. This would cause funny idling and stalling out.
Yes, it could.
old fuel filter
one thing you should check maybe one of your spark plugs blew out or the one or two of the wires went bad that is not too bad.
yes
A bad coolant temperature sensor is one thing that could cause an idling speed problem with a Peugeot 406. There could also be a problem with the idle control valve.