I have a 2001 Grand Caravan Sport 3.3L why 120k. I'm going to replace the spark plugs. So I'm removing the windshield wiper ay and Plenum for easier access. Does anyone know what the torque settings are for the Sparkplugs, plenum cover, and throttle body? Also any thoughts on how to clean throttle body and plenum and what type of cleaner to use? I also purchased the fuel injector seals. Anything special I should know about installing them? And I'm also installing a new serpentine belt.

Also do you think I should replace the upper O2 sensor because of easier access?

Thank you.