F3P revs periodically yo-yo at idle

[u33db]

Right, thought i'd cured this a few month back by fitting new leads but no, its back to haunt me.

Basically the car will idle fine but if left for a few minutes the revs will start to yo-yo between 300-900rpm and then stall if its not gunned a bit.

Any thoughts?

I suspect a good blast will more than likely fix it but i've not had it on the road since getting it and won't have a for a few months yet becuase of no tax/mot.

?

 

[Chris H]

lambda, hold it at 3krpm until its warm then see if its a lot more stable.

 

[u33db]

Thanks Chris, i'll give it a go.