Check the vacuum valve. Remove the valve apply 12 volts if you can hear a click it’s working also blow threw it with 12 volts applies if you can pass air threw then they are good if not replace. It’s possible that they are mixed up
Also I should mention that if it did misfire just because you don’t have a check engine light doesn’t mean head gasket isn’t bad more then likey it’s a cracked head they do this on start up when it’s cold 4runners with the 3.4 do crack the heads a lot and if it did overheat something also to...
Fan clutch a easy way to check is when it’s started u can use cardboard or something I personally use my hand I don’t recommend doing this for the inexperienced if u can stop the fan easy with the motor started your clutch needs new fluid or replace
Most likey the actuator is bad, slamming the door sometimes can cause them the free up I know this works sometimes with windows a trick is to hold the window switch and slam the door at the same time sometimes it can temporarily fix the problem