last week i went to start the car, and when i let go of the key the starter stayed on. probably for 1 minute straight. i tried to pull the fuse while the girlfriend kept working the key. it finally stopped. luckily the engine didn't catch. any ideas? sticky pins on the ignition? the battery was smoking and some of the battery plastic melted at the terminals. once i think i have the problem fixed what should i be careful of? what would you be worried about?