When i turn the key to start the car, half of the time it sounds like its going to start but it won't fire up. The other half of the time it starts right up like normal. What are some possible causes to this problem?

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When i turn the key to start the car, half of the time it sounds like its going to start but it won't fire up. The other half of the time it starts right up like normal. What are some possible causes to this problem?

How long has your 1999 Lexus GS300 had this problem?

About a month and getting worse