Yous hould be able to run w/o the IAC, if it runs well till it's warm then there is a sensor that kicks in when its warm, possibly a crank sensor? Also, are you buying name brand sensors or AutoZone/Advance sensors. Sometimes the sell you bad/wrong "new" sensors at these stores & you pull your hair out cause it's a new sensor & replace everything else when the new part itself was bad from the store.
(Had a couple buddys spend over a grand to finally diagnose their supposedly new/good sensors were bad.)
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