Hello everyone I have a Toyota Prius 2011 3rd gen around 155k miles that is throwing a misfire code on cylinder 3. I ran a can of the gumout (looks like the seafoam can) tuneup through the gas tank and the code disappeared for a month or so. I just got these plugs https://shop.advanceautoparts.com/p/denso-iridium-tt-spark-plug-ixeh20tt-4711/10713048-P?navigationPath=L1*14923%7CL2*15034 and am replacing them tonight weather permitting. I'm hoping I'm on the right track. Next thing is should there be anything else I need to look at while I'm in there? Say try testing the ignition coil? I've read where there have been fuel injector issues on these also. Any input is much appreciated!