If it is an ignition miss, than you can damage your catalytic converter, as raw fuel would be force through it.
The inside of your combustion chamber would also become very fouled up, and most probably ruin your spark plugs as well.
You probably wont cause any serious damage, but if you leave it long enough it could definately create more problems.
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I took it in for spark plug change. then about 1 week my car started to jerk and shake at stop lights. so i took it back and they said they couldnt read anything wrong with it cause the check engine light wasn't on. so they sent me home with my car misfiring for 3 weeks i had no choice but to drive it . thats my only car it was getting bad to a point that it shoke so bad the light came on .so took it back again and they so called fixed it .said it was a mis fire and 1 week later here i am again. misfiring. so are they responsible for my car since they sent me home for 3 weeks. could something worse had happened to my car during the 3 weeks.
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