ANSWERS: 2
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high idle can often be fixed by putting the car in neutral and revving a few times. this causes the car's computer to reset.
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Are you still having problems with the battery/charging system. If so, I have seen bad batteries cause, what is called the Idle Air Control (IAC) motor to act up. It makes the engine idle at a higher level. If you do have a bad battery, fix it. If your battery checks out alright, then pull the IAC out and make sure its clean. If that looks good, then you might just have a bad IAC motor, which would need replaced.
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