2004 Caravan, 60000miles
Replaced plugs, wires, air filter , added iso and injector cleaner. No improvement.

Started a couple weeks ago, will chug/hesitate especially cruising between 30-40 mph. Sometimes hesitates from a stop and is also noticable at highway speeds. No lights are on on the dash. Don't want to bring it to the stealership if possible.
Seems to idle fine and rev up ok.
Any ideas???