Very rough idle

[Yarp]

My idle is all over the place. It hunts about then eventually picks up and idles normally for a bit before repeating the cycle. It’s worse when cold but still not great when hot and will sometimes cut out when the revs drop. Plugs, injectors, coil pack, leads and lambda sensor are all new genuine parts. Any suggestions on what it could be? There’s no lights or fault codes showing either. Please ignore the fact the exhaust is blowing it’s tits off too. Ordered the wrong size sleeve for one of the joints, that’ll be sorted this week

 

[Louis]

Has it been mapped for the turbo? Does it do this hot and cold?

 

[Yarp]

Has it been mapped for the turbo? Does it do this hot and cold?

Yeah, EFI boost control module and map to match. Runs absolutely perfectly under load and when there’s revs when driving steadily, it just won’t idle. Gets slightly better hot but still all over and will sometimes cut out when the revs come down.

 

[Yarp]

Fitted a new set of plugs and leads today. The plugs were a bit suspect.

however, issue is still there as before so clearly they aren’t the issue. Vid below is what happens when it tries to rev from idle. Any other suggestions?