This is my first post and any help would be greatly appreciated. I have a 2004 Wrangler that has just started giving me issues. At stops it will idle between 800 rpms, make a slight clicking noise from the engine, and switch to around 1500 rpms and then lower back down to 800. Also, periodically when I attempt to climb a hill on the freeway, the rpms will jump from 2000 to 45000 going 60-65mph. After a couple attempts of letting off the gas, it will stabilize back to normal. I don't know if this has anything to do with it, but I just had the oil changed and valve cover gasket replaced due to a leak. Again, any help is greatly appreciated.