2004 Chrysler Crossfire

Steering problem
2004 Chrysler Crossfire V8 Two Wheel Drive Automatic 55,000 miles

i have 55,000 miles on my 2004 crossfire and most of the time the key will not start in the ignition. It will not turn. I have tried using my spare key and it still won't turn. And then all of a sudden it turns and starts the car. Can you tell me what will cause this? Do I need a new ignition switch or a new key.
October 2, 2010.

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