# 1991 Toyota 4Runner

**URL:** <https://community.cartalk.com/t/1991-toyota-4runner/117036>\
**Category:** Maintenance/Repairs\
**Tags:** toyota, 4runner\
**Created:** [May 9, 2018, 12:48am UTC](https://community.cartalk.com/t/1991-toyota-4runner/117036 "2018-05-09T00:48:21Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Charles19](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/charles19/32/11930_2.png) [@Charles19](https://community.cartalk.com/u/Charles19)\
**Post date:** [May 9, 2018, 12:48am UTC](https://community.cartalk.com/t/1991-toyota-4runner/117036/1 "2018-05-09T00:48:21Z")

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My 1991 4Runner wants to “die” when it idles. It will idle regularly but then every 3-5 seconds the RPMs will drop and then return, drop then return, so on and so on. I haven’t noticed any other issues, it seems to only be when idling that the problem occurs.

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**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:** [May 9, 2018, 1:29am UTC](https://community.cartalk.com/t/1991-toyota-4runner/117036/2 "2018-05-09T01:29:24Z")

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check the Idle air control

For the 2.4 l4 4 engine

 ![image](https://global.discourse-cdn.com/cartalk/original/2X/5/522e6fb4cab8f605707fea5d86bf0b2ab0f39d34.jpg)

Mass air flow sensor  
For the 3.0 V6 engine

 ![image](https://global.discourse-cdn.com/cartalk/original/2X/a/a7d74dcc607da4a9fcbbe4b8b58db5dd4b0a446d.jpg)

Yosemite