Pastor Marvin Winans -- the man who M.C.'d Whitney Houston's funeral service -- was carjacked at a Detroit gas station early Wednesday. According to WXYZ, Winans was pumping gas when some scumbag roughed him up and stole the 54-year-old's Infiniti QX56 SUV. The pastor told a WXYZ reporter he had a feeling this was "not a good situation" when he first saw the group of guys who eventually jumped him. Winans -- whose family is legendary in the gospel music world -- was not seriously injured, but his son, Marvin Winans Jr., tells TMZ his dad has checked into a hospital to get treatment. According to police, 4 suspects jacked an undisclosed amount of cash from Winans, and got away in the SUV. They describe three of the suspects as Black males. Marvin gave the eulogy at Whitney's funeral in New Jersey back in February -- and thanked Whitney's mom for bringing "the world" to church.