RepairPal Certified shops can diagnose and repair your 2007 Mitsubishi Galant. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
This could be a transmission issue or a computer sensor problem. Could also be throttle problem as well. Hands-on inspection is needed.
Use this link to find a good shop near you.
https://repairpal.com/repair-shops
Alex