I'll take a guess..... The Mass Air Butterfly may need to be cleaned and or lubricated.
I have seen other posts here with the same basic troubles and it has been suggested before.
This is a spray lubricant made for the purpose of lubing the pivot points of the Mass Air Butterfly... Available at most Auto Parts Stores..
Good luck.. "BH"
07-JKU-X /Poison spider Evap.Skid/Master craft grab handles/Or-Fab spare tire-can carrier/ Gibson SS Duals/ Q-tec Floor Liners/Hidden Hitch Receiver/ AntennaX 7inch/ 48" Hi-Lift./ 8"X16"X4"bs Steel smoothie wheels/ 265X75R-16,Kelly Safari TSR tarz.
Viet Nam Veteran 69-70, Troop "D" (AIR) 3/4 Cav. ,25th Inf. Div. CUCHI RVN. UH-1H Crew Chief of the "Pinball Wizard" 68-16224. Call Sign "CENTAUR".