05 Pacifica 35mph hesitation

I have an 05 pacifica with 80,000 miles on it. Everything is in good working condition but when I am steady on the gas and holding at 35 mph there is a stumbling like a misfire or transmission shifting back and forth between gears. It runs excellent otherwise and no codes are tripping. Does anyone have a suggestion for where to start?

Maybe spark plugs and/or wires....