2006 Chrysler Sebring Hesitates while driving and loss of p

I have a 2006 Chrysler Sebring. While driving it kind of bogs down. When you press the gas pedal down during the hesitation, the engine will rev higher but there is no power for a few seconds. Also, while sitting at a stop light it will idle fine for a few minutes and then idle rough as if it wants to stall. Today while I was driving I noticed when I put my turn signal on, the dash board lights dimmed. I just had a tune-up, fuel system cleaning and replaced the throttle position control sensor. The dealership kind find anything else wrong.