2009 g37x here and was looking for some advice regarding these two problems i’ve been having, about a month ago id say I noticed I was having some rough idling, jolting, and rpm spikes at idling or when stopped, eventually a check engine came on and I got it read and it was a cylinder one misfire, most of the signs led me to believe it was the spark plugs along with the originals still being in the car 125k miles.

Fast forward to Last friday, I go through the process and change all the spark plugs and everything seems good, car is running smooth, no jolting, spikes, shaking, etc. It could be a fluke or maybe I only noticed it leaving work today (Tuesday) But I noticed some very minor jolt/idling with each time it happened the rpm’s fluctuating but very slightly, definitely not nearly as bad as before and no lights or anything have come on yet, I’m trying to deduce what this might be

Again, this could also be a coincidence maybe it’s been happening and I just noticed it but I’m hearing a clicking coming from the engine and I’m looking for some advice on if this is a normal noise and i’m being paranoid or something. My G is the first car i’ve really cared about and put time, labor, and work into to try to upkeep and give it a long life, I’m still beginner when it comes to mechanics because I’m trying to learn frfr so bare with me, I can provide videos of both I just need to condense the files.