Rough Idle after jump-starting 560 SEC

I had to jump-start the car, and since then it had been idling very rough. I've read that jump-starting can sometimes fry fuses and/or ECUs - does anyone know more about this, which fuse might be blown, how to locate the
fuse, which electronic components might be affected?
Thanks!
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There's a problematical relay that can cause strange behavior; it's called the "overvoltage protection relay" and has a fuse on its top. At a GUESS I'd first look there.
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