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95 Pickup, 98 Amigo
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Another technique you could try before replacing it is to soak the vacuum line going to it in PB Blaster / penetrating fluid overnight with enough fluid to submerge the IAC. Quite a few people have had luck with that.
 

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This video shows the location at 2:25 ish. I couldn't really see it by eye when I looked for it myself, but used my phone to take a video with the flash on to locate it. Then just follow that hose, unplug it, and fill it up for a good 24 hours.
 

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Yeah pull off the other end of the hose (the side not directly touching the IAC). And then spray like a quarter of a can into it. It'll make sense once you identify it. It's like making a beer bong of PB blaster for the IAC to get shoved down it's throat.

The hose had a hose clamp I couldn't see until I was eye level with it. Make sure to remove that before tugging on the line.
 
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