More Issues With the P5

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2003 Mazda Protege5
Has anyone experienced this?
When I'm driving, the car will drop a few hundred RPM and then raise again back to the original RPM abruptly and the car will lurch very violently and make a horrible sounding clunk (I assume that is the gearbox or something cause the gear shift moves back and forth violently.) I'm praying that is the misfire issue and not a broken transmission as it only does it randomly and not too often and doesn't matter what gear it is is.
 
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