My audible sounds like chipmunks?

I plugged it into my car radio with the iPod cord, played fine on the way to the store. I get back in and then it sounds sped up. I'm using an iPod classic 160gb, checked the settings, it's in normal and doesn't change when I choose slower or faster. Music plays fine. It also won't let me select audiobooks from my car menu like it does music. I click on the title and it doesn't move. Any suggestions?

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