Needing some advice
Recently replaced thermostat housing on 2006 RR sport hse with the 4.4. Had to take the intake loose to replace and no store had a new intake gasket. Used the old one cause was in a hurry to get this girl back on the rd. The engine is idling rough and get a code for banks 1 and 2 lean. Now I know that it does have a bad 02 sensor and has been awhile since the plugs have been changed as well and the lady that owns it said it has been idling rough before I put the new thermostat housing on it for her. Should I pull the throttle body and clean it good and change plugs or do you think possibly the intake gasket has something to do with this? Any help would be greatly appreciated