# Idle drops low and wants to stall

**URL:** <https://community.cartalk.com/t/idle-drops-low-and-wants-to-stall/37804>\
**Category:** Maintenance/Repairs\
**Tags:** ford, f150\
**Created:** [October 8, 2009, 7:50pm UTC](https://community.cartalk.com/t/idle-drops-low-and-wants-to-stall/37804 "2009-10-08T19:50:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![captlee](https://avatars.discourse-cdn.com/v4/letter/c/46a35a/32.png) [@captlee](https://community.cartalk.com/u/captlee)\
**Post date:** [October 8, 2009, 7:50pm UTC](https://community.cartalk.com/t/idle-drops-low-and-wants-to-stall/37804/1 "2009-10-08T19:50:53Z")

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have a 94 f-150 v-8 302 fuel inject. When the truck is cold on start-up it idles fine for 2-3 min. then idles down to stall speed, if driving it will pop and studder, then take off like a rabbit (not the VW one) It sounds like a vacuum problem but which one?

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**Author:** ![tardis](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@tardis](https://community.cartalk.com/u/tardis)\
**Post date:** [October 8, 2009, 8:27pm UTC](https://community.cartalk.com/t/idle-drops-low-and-wants-to-stall/37804/2 "2009-10-08T20:27:56Z")

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Clean or replace the Idle Air Bypass Valve (also known as IAC), and check the throttle body to see if it needs cleaning to.