Suspect throttle linkage or shifter malfunction. Hands-on inspection is needed. If you don't work on your own car then use this link to find a shop near you.
https://repairpal.com/repair-shops
Alex
RepairPal Certified shops can diagnose and repair your 2009 Chrysler Sebring. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.