Jeep Grand Cherokee Forum banner

spark plugs

  1. Drivetrain Tech Center
    Recently acquired a 2004 Overland (4.7L HO, of course, and about 110,000 mi) and I think I either have a slight occasional miss or maybe a tranny issue. Runnung 87 octane and things seem to be doing decent around town with an occasional downshift when slightly unexpected (even with the lightest...