scrape it as clean as possible. use a machinists straight edge to check for flatness in as many orientations as possible. if its not fucked just use a thicker than stock head gasket for extra squish
Could be the wiring harness. @Awafrican had a lin get bent and not insert all the way that gave him hell for a while so look at the harness and plugs while you are there
If it won't throw a code you might need to buy one new coil pack. I know that my car basically won't throw a misfire code ever so its tough to troubleshoot
Iridium plugs do last forever.....
Hope that part number is stock heat range
Swap the no 2 coil pack and see if the misfire stays on 2 or follows the coil
Is important to note that flow under pressure vs under vacuum is going to behave very differently. Flow bench data is nice to have but I wouldn't use it to shit on one manifold over another.