I took the Xterra to the dealership to get a rough idle looked at and see if they could get my TPMS light to stay off. The rough idle was fixed by reflashing the ECM per service bulletin 13-021 which I had printed out for them when I took it in. It idles way better now, before when I would stop at a light it would vibrate pretty bad, way worse with ac on.
I also let them change the spark plugs (gasp!) I know, I could have done the job myself but time has not allowed me to and to be honest I didn't care to mess with pulling the intake to get to the pass side plugs. It was past due for plugs, and as it turns out I also had a spark plug tube seal bad on the passenger side valve cover, the plug and boot on that cylinder were submerged in oil! so I had that replaced also. If I had been in the engine myself and found that, the truck would have been down temporarily until I could get the valve cover. The dealership had the part on the shelf.
Kudos to my service advisor John at Hudson Nissan, he actually went out to the shop for me and took a picture of the cylinder head when the valve cover was off so I could see what condition things were in inside the engine. Looks like I scored a good truck because inside the engine still looks brand new with 123k on it. Not even a hint of oil sludge, so the previous owners kept up the maintenance!!! That makes me feel way better about the mileage on the truck. In comparison my old '01 had an enormous amount of sludge built up when I changed valve cover gaskets at a similar mileage, from previous owner neglect of course.
All in all my wallet is a bit lighter today, but the x is running better than ever, no more rough idle so I am happy. (That darn tpms light is another story...) I know how most of you feel about dealerships, but honestly these guys treated me great (didn't even buy it from them) and their price was better than I expected for the work they did.