Most sore throats result from viral infections, usually colds, but possibly influenza. In children or adults who were not immunized, the measles, chickenpox or whooping cough can cause a sore throat. Sometimes, a canker sore or fever blister forms in the throat, causing intense pain upon swallowing.
Many vehicles available today come with fuel pump shut-off switches. These devices are essentially circuit breakers that sit inside you car's airbag control module's inertia switch, which is supposed to trigger when the vehicle comes to a sudden stop.
On a carbureted engine you may otherwise find a run-on solenoid. The function of this part is to completely shut off the air intake at the carb when you turn off the ignition. If either of these devices is out of whack, fuel/air mixture can get into the engine after shut-down, causing run-on.