Is the car modified at all? It could be an air leak into the manifold or I had a few problems with the idle air assist valve. It's the one with a u shaped vacuum pipe from the little valve in the cylinder head to the throttle/inlet area.
https://images.app.goo.gl/VbMmS1C967pxyw8y7
Clamping that pipe off with some mole grips made a massive difference in my cold idle, smoothed it out loads. So worth a try.
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Have you been tuned for those mods?
Mine was pretty bad on idle with all bolt ons and standard tune. Again it might be worth Clamping that vacuum pipe. Has the idle issue appeared suddenly or has it been there since fitting anything?
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Who mapped it out of interest?
I'd be checking for any air leaks after the throttle by spraying a small amount of brake cleaner around throttle body, inlet manifold and any joins or fitting, if its drawing air in, it'll rev a bit higher as it sucks in the brake cleaner. This will help locate or rule out any leaks.
To clamp the pipe some mole grips or brake pipe clamps will be fine. Failing that just holding the pipe with some pliers while you open the throttle by hand should be able to determine if it makes a difference.
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Yeah Jesse has done mine twice now, no issues at all. Typical it would start messing around on the way back!
Yeah if it does cure the fault then you can remove it. K tuned sell a kit but it's stupidly expensive. EBay do a 3/8 npt bung from memory for a pound and stick a bolt a bolt in the pipe, job done. The valve is really brittle though, so go steady playing with it until you're ready to replace it or leave it be.
Try those and if that's not fixed it do a video to show what it's doing.
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I'd upload it to youtube and post the link here.
It's a difficult one to get to the bottom of. Have you tried cleaning the idle control valve and resetting the ecu parameters? There's a guide on the forum of how to do it I believe.
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The M2 doesn't have anywhere for the pcv valve pipe does it? How did you get around that? Also, was the water housing removed from the M2?