running well but not at idle, stumbly, IACV dirty?

[Indolent]

ka24e
motor pulled
clutch swap

stumbly/shakes at idle like there's no spark/fuel
injectors out, they all shoot, cyl 3 seems a lil weird/weakish but squirts
spark plugs/wires are fine

when driving it seems normal, just at idle it shakes, i've searched and read that it's possibly a dirty idle air control valve and to clean it out, but what i don't understand is that it was running fine before we pulled the motor, maybe i didn't search enough but flame if you must as long as it's helpful regarding my problem, thanks in advance

[Indolent]

mausage length.

[gfisch]

Well, should be able to check the fuel injectors and spark by pulling each injector plug and spark plug wire while running and see if it makes a difference in the way it runs (should shake and stumble).

In my car, it was the IACV valve that was clogged up with gunk. I sucked about half a bottle of seafoam through the vacuum line to the IACV from the intake (in small amounts at a time, just enough to make it start to stutter but not stall)

After cleaning it, car ran beautifully again.