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I had a bunch of similar misfires. Pull your plugs and coils and check them out, if they look foul, replace them. I would start with plugs just because coils are fairly expensive and then try plugs next. The Spark Plugs should last you around 60k miles but since you are running a Dinan tune it is very likely that they have gone bad after only 30k miles.
Since none of it has been changed, pull the plugs and coils and check it out.
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