There are many ways you could cure a rough idle. You must first diagnose why the problem started in the first place.
why does my vr commodore idle rough when at complete stop
Why does my 2001 kia sportage idle rough?
rough idle smell gas
When the idle goes rough, you must idle the plugs. Else the car plugs roughly.
With mine, the rough idle was fixed by changing the spark plug wires.
The Dodge ram 1500 rough idle can because by a bad spark plug or spark plug wire. The rough idle can also because by a bad camshaft.
If an alternator is going bad it can cause a rough idle in a 1993 Subaru Legacy. Cold temperatures in the winter can also cause a rough idle in the Subaru Legacy.
yes mine had a really rough idle and it turns out the motor mount needed replacing
What can cause a 1195 Oldsmobile to idle rough?
What causes a car to idle good and run rough when you give it gas?
e.g.r. valve replacement fixed mine. symptoms where rough idle and "surged".
Check the motor mounts.