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Hi all. I have a 206 SW 1.4HDI which has developed an issue when idling with the car at operating temperature.

The revs dip and it's like it's trying to stall but the engine stops itself stalling. This only occurs when the engine is hot.

When this happens there is a sound toward the left of the engine bay like it's sucking in air and then it escapes quickly.

When monitored on the torque obd app the vac readings go wild when it happens from around -1 to -16 fluctuating constantly.

My initial thought was either vac leak or egr but I found that when this happens if I unplug the air intake temper sensor it stops immediately and idles correctly. Plug the sensor back in and it's back to erratic.

Here is a quick video:

https://youtu.be/JHlhvXwY4Q4

Any ideas?

Thanks
 

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