Poor Idle on 1.3 Charade (1999/2000)

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Hello All

Just signed up hoping for some helpful info. No stranger to car forums myself, but trying to get some help on my GF's car.

The car starts and runs fine from cold, but once warm it has a really rough idle to the point where a lot of the time it stalls when the clutch is pressed in.

I'm assuming that this is electrical and wanted to rule out any sensors before replacing anymore parts.

I know on my Honda you can run a self diagnostic by bridging the connection with wire, and I've read about doing the same process on a Sportrak on this forum.

Is the same thing possible with the Charade?? I have come across the diagnostic connection under the bonnet. Any help would be great! Thanks