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I have a 2003 zx3 2.3 the car starts right up idles fine for a min then bogs way down then jumps back up. It does this every few min. We have cleaned the IAC valve and the throttle body. When we unplug a spark plug it stops it just idles rough but no bogging. Please help
 

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Sounds like your a/c is cycling on and off. And if you have your vent selector on the windshield but the a/c off, it'll still cycle your a/c. It'll put enough load on the motor to make it bog before the iac can compensate.

Your alternator can also put a huge load on the motor...
 

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As Levi said, please confirm if this is happening only when the AC is on. If yes, it sounds like your IACV is not working or AC clutch & compressor might be adding an unusual amount of drag on the serp belt/engine.

@focusknot, the OP has a 2.3 so the famous and common cracked coil pack does not apply to that engine.
 

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PCV hose under the intake loop.............common on these. Vacuum leak.
 
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