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Hi,

Elantra 2002: The car started revving up when I start (to 2500 rpm) , or when at park. After a minute, it comes down to 1200-1500rpm. This doesn't happen when I am driving.

Also, when I stop at a signal, it shakes a bit.

Any ideas what's going on?

Thanks.
 

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With the check engine light on, go stop by autozone/etc. and have them plug in a code reader. It is free and then you can look up the code and know exactly what is wrong, rather than internet guess work.

FWIW, I suspect vacuum leak.
 
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