# Racing engine

**URL:** <https://community.cartalk.com/t/racing-engine/43496>\
**Category:** Maintenance/Repairs\
**Tags:** cherokee, jeep\
**Created:** [January 30, 2010, 8:04pm UTC](https://community.cartalk.com/t/racing-engine/43496 "2010-01-30T20:04:06Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![JamesE1](https://avatars.discourse-cdn.com/v4/letter/j/a88e57/32.png) [@JamesE1](https://community.cartalk.com/u/JamesE1)\
**Post date:** [January 30, 2010, 8:04pm UTC](https://community.cartalk.com/t/racing-engine/43496/1 "2010-01-30T20:04:06Z")

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I have a 2003 Jeep Grand Cherokee with 70k miles. The engine races when in park when it is started , going up to 1900 rpms or so. Sometimes it comes down below 1000 and sometimes it doesn’t. Sometimes it races up and down while being driven . Neither the dealer nor two mechanics could figure out what it is ; although one mechanic changed some part out , the name of which now escapes me , but it may have been some electronic part . The check engine light is on continually . Has anyone had that problem ?