# 2006 Chrysler Pacifica engine revs up and down at idle **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chrysler, pacifica\ **Created:** [October 24, 2018, 12:00am UTC](https://community.cartalk.com/t/2006-chrysler-pacifica-engine-revs-up-and-down-at-idle/127439 "2018-10-24T00:00:02Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![TERRYWORKENS](https://avatars.discourse-cdn.com/v4/letter/t/e5b9ba/32.png) [@TERRYWORKENS](https://community.cartalk.com/u/TERRYWORKENS)\ **Post date:** [October 24, 2018, 12:00am UTC](https://community.cartalk.com/t/2006-chrysler-pacifica-engine-revs-up-and-down-at-idle/127439/1 "2018-10-24T00:00:02Z")
changed spark plugs and a coil pack on cylinder #2 as it had a slight misfire per my OBD Scanner. after putting it all together including the upper intake manifold. upon start-up i get the engine revving up and down at normal idle, i had to disconnect alotof elect. commectors as well as egr tube into intake manifold. what is happening? ---
**Author:** ![oldtimer-11](https://avatars.discourse-cdn.com/v4/letter/o/e79b87/32.png) [@oldtimer-11](https://community.cartalk.com/u/oldtimer-11)\ **Post date:** [October 24, 2018, 3:01am UTC](https://community.cartalk.com/t/2006-chrysler-pacifica-engine-revs-up-and-down-at-idle/127439/2 "2018-10-24T03:01:18Z")
Probably a vacuum leak. Either at the intake manifold or at a rubber vacuum hose. ---
**Author:** ![Yosemite](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/yosemite/32/643_2.png) [@Yosemite](https://community.cartalk.com/u/Yosemite)\ **Post date:** [October 25, 2018, 3:17am UTC](https://community.cartalk.com/t/2006-chrysler-pacifica-engine-revs-up-and-down-at-idle/127439/3 "2018-10-25T03:17:18Z")
I think that you have a vacuum hose that you didn’t reconnect. Go back over your work. Yosemite