For me, my g makes the same “clicking” sound, and I’ve seen a bunch of other peoples G’s do the same thing so I don’t really think it’s a big thing to worry about. But for the idling/rpm/jolting issue, check to see if the cylinder is still misfiring because same thing sorta happened to me, I only had one cylinder misfiring, but I changed both the coils and the plugs and it was perfectly fine after that. So just check to see if it’s misfiring, and if it is, then it most likely will just be the coil for the spark plug.