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Old 07-31-2013, 07:10 PM   #11
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I had the same issues--worse with ac--intermittent stumbling--hesitation. No codes. No improvement with changing plugs/fuel filter.
I finally replaced the lifetime air filter (restriction gauge still in the green) and all problems were resolved!
Maybe a dirty air filter!
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Old 07-31-2013, 08:16 PM   #12
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Remove the IAC and clean it. Re-install, no gasket needed on this vehicle.

If you lack power going uphill, floor it. All these cars have a circuit that cuts power to the AC clutch when you push the throttle to WOT. You'll smell that the compressor has cut off.
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Old 08-01-2013, 03:01 AM   #13
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IAC? where and how?
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Old 08-01-2013, 05:10 AM   #14
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That depends on your engine. On the Zetec it is located under the intake manifold. I don't know where it is located on the SPI. This is sort of what it looks like- I found the pic by searching for the SPI IAC. All of them look similar, but the orientation of the electrical connector might be different. You just unbolt it, and use carb cleaner to clean the inside. You might want to replace it also. This is what controls your idle- provided you don't have a vacuum leak or damaged PCV vacuum line.

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Old 08-01-2013, 08:41 PM   #15
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I thought something was wrong with my car because i noticed that it lacked the proper performance when the A/C was on. After reading through this, i am happy to know its normal :P
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Old 08-01-2013, 09:25 PM   #16
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There positively IS a gasket of some sort used there, it usually sticks to the plastic intake. If hard as a rock, then you have all kinds of possibilities for leaks there, which will complicate your issue greatly. The old gasket will not rebound out to reseal for squat if old enough and hard enough. I use a quick gasket cut out of paper gasket material and leave the old rubber one in place. The paper one then sinks into the rubber and at edges to seal perfectly. Often a replacement IAC has that same gasket in the box, USE IT. Do NOT remove the old rubber one.

Or use some silicone applied to the flat, but maneuvering trying to line up bolts to install part can often mess that up to not work.

I cut the bottom bolt hole small so bolt threaded into gasket is held there then install IAC. Bolt in place makes it easier to get bolt started by hand. Tighten just enough to keep IAC from swinging out of place from its' weight and then install top bolt. Piece of cake and quicker than spit.
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