Have 04 Sebring with 2.7V6, 80,000 miles. It hesitate while in drive when engines fully warm. I have been told probably need throttle body cleaning. Is this true?

Buy a can of Valvoline Throttle Body Cleaner and clean the throttle plate and throttle body yourself. It takes only minutes.

Perhaps a professional injection cleaning would help, too. I recommend you take it to someone who has the skill and tools to tap in directly at the fuel rail and use a quality cleaner.
The stuff you add to the tank isn't strong enough to clean what may well be very dirty fuel injectors. If it was, it would be too harsh for fuel tanks and other components. The only thing that little bottle is good for is cleaning your wallet.