# 1998 Jeep Cherokee rpms shoot up and down

**URL:** <https://community.cartalk.com/t/1998-jeep-cherokee-rpms-shoot-up-and-down/127261>\
**Category:** Maintenance/Repairs\
**Tags:** cherokee, jeep\
**Created:** [October 21, 2018, 3:11pm UTC](https://community.cartalk.com/t/1998-jeep-cherokee-rpms-shoot-up-and-down/127261 "2018-10-21T15:11:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![MariCurrey](https://avatars.discourse-cdn.com/v4/letter/m/96bed5/32.png) [@MariCurrey](https://community.cartalk.com/u/MariCurrey)\
**Post date:** [October 21, 2018, 3:11pm UTC](https://community.cartalk.com/t/1998-jeep-cherokee-rpms-shoot-up-and-down/127261/1 "2018-10-21T15:11:32Z")

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Recently, if I am driving around 40-45 MPH, my RPMs will shoot up and down until I leave that speed zone. I also had an experience around the time that this started, where I was stopped at an intersection waiting for my opportunity to pull into the road. I was still in drive, with my foot on the brake. As I waited, my car began to rumble and shake (which is not unusual while I am stopped - I usually toss it in neutral to decrease the rumble but I did not because it was almost time to pull out) and then the RPMs started to shoot up and down then my car tried to launch itself into traffic. I had to press the brakes down with both feet to keep from going into the road. Any thoughts?

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [October 21, 2018, 3:22pm UTC](https://community.cartalk.com/t/1998-jeep-cherokee-rpms-shoot-up-and-down/127261/2 "2018-10-21T15:22:43Z")

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Bad idle air control valve, maybe.