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The most common cause of a misfire condition on your vehicle would be faulty tune up parts. This is very common and easily fixed by doing a simple tune up.
Some other possible causes (not so common) would be sticking or burned valves
Broken valve springs
faulty fuel injectors
bad camshaft or crankshaft position sensor.
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It may simply be a coincidence that it happened right after you slammed on the brakes. Or something could have logded itself or moved/shifted either inside the engine or outside of the engine (like the tune up parts) just right so that a plug or something has moved causing the engine to misfire.