1993 Grand Marquis problem
 

Tonight I was leaving a parking lot and my car would not hardly go at first the engine ran fine so it is not that. When I stopped later it once again did it. I had to stop a minute or two later for an intersection and the car did good. Then when I stopped again and went up a hill it went once again seemed like it did not want to go. Does anyone have any ideas as to what this could be?