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is it random misfire, or is it pointing to a specific cylinder?
You did not say in your post that I saw. If a specific cylinder, do a compression test to eliminate valves not closing, then the obvious - coil, wire, injector.
If it is RANDOM misfire, then almost for sure an intake leak or vacuum leak. find it by using a can of ether and squirting until engine note changes.
carb cleaner and wd40 don't work anymore.
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