I heard the electronic throttle is connected to a lot of things. What would be advisable would be to get to a good garage / autozone and let them code read the car if you have lights in the dash. If you've never done a throttle service, 3m has one of the best throttle service /mpg treatment kits out there.
If not...get your car battery and alternator looked at to make sure that it is running okay. A dying battery drains an alternator more than usual, and a damaged alternator causes ghosts to happen everywhere.