Cold stall lumpy idle

[Corasdad]

I changed my spark plugs and my car developed an issue the tick o er is very low when first starting and dies, so I changed my plugs back but still same issue.
I turned the idle screw up but that only seams to matter when it's warm, my accelerator cable is quite sloppy so I will change that but whats is the other other cable

My car is 1.8 auto

[Corasdad]

OK the issue seems to be when I put it I. Drive the revs drop, any ideas

[boiliebasher]

Changing spark plugs will have next to zero effect on idle RPMS. What's probably happened is you've unintentionally messsd up a HT lead so it's probably running on 3 cyls instead of 4. If not you've disturbed something and possiblity created a vacuum leak leading to a weak mixture.

[Corasdad]

I can't have mixed them up as I did one at a time, I am going to order new ht leads as I don't know how old they are and I may have damaged one taking them off, I don't think I have damaged them as when I pull them off one at a time the engine drops to three cylinders, but maybe it's not getting as much spark if that's a thing.
I have read it's possible the coolant sensor but I can't find it

[Corasdad]

I have taken the icv off and cleaned that but wants to stall when cold

[boiliebasher]

I'm still going for vacuum leak. I didn't mean messed up firing order, simply broken the contact inside.

[boiliebasher]

If it was working fine before you changed the spark plugs and it isn't now, you've obviously disturbed or upset something in the process

[Corasdad]

Where would a leak need to looked for I have looked at maf that all seems, but I do have a spare electrical connector not plugged In To anything but it never was so that can't be an issue