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A misfire on one cylinder like this here (cylinder 4) can indicate a fault with a worn spark plug,spark plug wire/boot at fault or ignition coil at fault.This can also be an issue with a faulty fuel injector that isnt atomizing fuel into the cylinder properly or even low cylinder compression on the #4 cylinder due to an issue with piston rings,cylinder wall damage or valve damage in the cylinder head.
This will have to be tested/diagnosed further to locate the cause of the misfire and then from there repaired.
I would start off with having a compression test done to make sure this isnt a fault with piston rings,cylinder wall or valve damage.Then from there the fuel injector needs tested as well as spark to the cylinder to locate which is the cause.
Most common is a spark plug needing replaced or an issue with the ignition coil or a fuel injector fault.This will need tested/checked further to locate and repair this here.
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