Car rocks side to side in idle and slow speed


#1

is this dangerous? just started: subaru outback 2003- cant get it looked at until friday august 15


#2

If the entire car is rocking while the engine is idling, that is…not good.
Subaru engines, by their nature, are very well-balanced, so this is definitely abnormal.
You may have broken motor mounts and/or the engine may be very badly misfiring.

Is the Check Engine Light lit up?
And, if so–is it lit steadily, or is it blinking?


#3

Could be a lot of things, including the harmonic damper.
Hopefully it’ll just be a bad spark plug. When was the last time you had a tuneup? How well has it been maintained? How many miles are on it?