# intake manifold question

**URL:** <https://forums.speedlife.net/t/intake-manifold-question/93030>\
**Category:** SON240sx Automotive\
**Created:** [February 19, 2006, 6:57pm UTC](https://forums.speedlife.net/t/intake-manifold-question/93030 "2006-02-19T18:57:08Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![absolum](https://avatars.discourse-cdn.com/v4/letter/a/e47c2d/32.png) [@absolum](https://forums.speedlife.net/u/absolum)\
**Post date:** [February 19, 2006, 6:57pm UTC](https://forums.speedlife.net/t/intake-manifold-question/93030/1 "2006-02-19T18:57:08Z")

</div>

Are the iacv-aac valve and AAC/IACV valve interchangable in all years 240sx 91 to 98 ?  
My idle goes crazy sometime and fluctuate , At least I am not running rich like I used to , The plugs are the same and even the connectors coulors are the same .  
Anyway , I was planing of replacing the lower intake manifold but if all valves are the same then I can just swap them from my 98 intake manifold .  
Can someone please confirm this .

thanx for reading .