vibration at stop and on drive gear.

[Mathieu Tetrault]

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Hi



I have a 1986 coupe gt.  When I stop the car and let it on drive gear,
the car vibrate a lot. I have to put in on neutral gear to make it stop.
Someone told me it could be a part call hydro-mounting. It secure the
engine.



Also I replace the catalytic converter. I want to know if not using the
spring nuts on the front end can damage something.



Thanks



Mathieu Tétrault