Engine Exhaust System problems of the 2007 Ford Freestyle

I have a 2007 Ford Freestyle and its just getting worst and worst as the milage goes up. The car seems to have a mind of its own. I cant even use my a/c or heater as this causes the car to lung forward hard and eventually the car cuts off causing ingine and wrench light to cut on. While backing into my parking garage I ran into the builing because the car lunged back by itself, this could be very dangerous, could cause me to hit someone or something very badly. Im afraid to drive my vehicle but dont have any other choice, have to go to work. This is scary, I need help with this. Just bought this car dont have the cash to have it checked out.

2007 Ford Freestyle. Consumer states vehicle had a burning smell and stopped running while driving the consumer stated the catalytic converter was replaced. A few days later, the burning smell returned and the vehicle stopped running. The dealer replaced the catalytic converter again. The consumer stated the catalytic converter was replaced three times. Also, the manifold, gasket and seals had to be replaced because they melted due to heat. Three months later. The oil light illuminated. The service mechanic informed the consumer there was no oil in the engine and he was unable to see any type of leak. The consumer was informed the entire exhaust system needed to be replaced as well as the ignition coil and fans, because the vehicle would probably overheat.

I own a 2007 Ford Freestyle. The car will accelerate or lurch forward when the brake is pressed. It happens when the ac is on and the temperature outside is hot. The car will then idle low and then shut off. The wrench light on the dashboard will light up. Once I restart the car, the wrench light goes off and the car runs normal until I come to a stoplight and then the car lurches forward again. It also happens when you put the car in reverse when the air is on and the outside temperature is hot.