I have 360,000 miles on the car. During the milder and colder seasons it has good pickup and the engine shuts off when I turn off the ignition. However, in the hot weather the car has almost no pickup when starting from a dead stop. Plus, it continues to run for a few minutes after I turn off the ignition. When this happens the door locks don't lock. Once I get the car above 30 miles or so, the acceleration seems good.Any help will be appreciated.