# My 1990 Gmc Sierra is possessed

**URL:** <https://community.cartalk.com/t/my-1990-gmc-sierra-is-possessed/44090>\
**Category:** Maintenance/Repairs\
**Tags:** gmc, 2500\
**Created:** [February 8, 2010, 3:23pm UTC](https://community.cartalk.com/t/my-1990-gmc-sierra-is-possessed/44090 "2010-02-08T15:23:46Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![gm1776](https://avatars.discourse-cdn.com/v4/letter/g/9fc29f/32.png) [@gm1776](https://community.cartalk.com/u/gm1776)\
**Post date:** [February 8, 2010, 3:23pm UTC](https://community.cartalk.com/t/my-1990-gmc-sierra-is-possessed/44090/1 "2010-02-08T15:23:46Z")

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my truck after it warms up completely cuts out at low speeds like when idling through a parking lot. The lights flicker and the truck will die it cranks right back up but will continue to do this. I have tried The IACV on the tbi, spark plugs and wires, fuel filter please help

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**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\
**Post date:** [February 8, 2010, 3:40pm UTC](https://community.cartalk.com/t/my-1990-gmc-sierra-is-possessed/44090/2 "2010-02-08T15:40:04Z")

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Have you tried looking for vacuum leaks?

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**Author:** ![gm1776](https://avatars.discourse-cdn.com/v4/letter/g/9fc29f/32.png) [@gm1776](https://community.cartalk.com/u/gm1776)\
**Post date:** [February 8, 2010, 3:44pm UTC](https://community.cartalk.com/t/my-1990-gmc-sierra-is-possessed/44090/3 "2010-02-08T15:44:54Z")

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yes and no vacuum leaks were found My mechanic is even stumped.