It sounds like the stater may be going bad. There is a solenoid on it that can cause the problem. If you are getting a clicking, the ignition and starter relay are doing their job.
Try this. Have a helper turn the key to the start position while you check the voltage to the smaller wire on the starter. You should be getting 12+ volts. If you are, the starter needs replaced. Do this when the starter isn't working.
If you have other questions, let me know.
Joe
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Thursday, October 1st, 2009 AT 7:10 PM