90rulegacy

after i replaced a injector my idle went below 500 rpm , no stalling just a very low idle.It has new spark plugs, wires..the car has 164,000 miles on it , and other then a very low idle it runs great.....?????? i dont know...any thoughts????

i need to know if the big screw under the cover bracket on the throttle body is an idle adjustment screw ...this car is a 90 legacy 2.2 AWD A/T.....any help would be nice..thanks 90rulegacy