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The injector just pulled out...? That can't be good. It should be secured by a screw and a retainer.
To check the injectors you need all of them out of the head with the supply lines still attached. You also need to pull the rubber boot which connects the air flow sensor to the throttle. And you will need to run the fuel pump without starting the engine. It would help to have an assistant.
There should be a cap screw right next to each injector. Remove them and the retainers and pull the injectors. Remove the rubber boot (roughly conical in shape). It has hose type clamps. At some point you will be needing to lift the air flow plate and there's not much to grab ahold of except the screw which fastens it to a lever. I have taken a loop of string and lifted the plate enough to slip the string around the plate so that it can be lifted easily when the time comes. Be careful not to bend that lever. You won't have to lift the plate much.
Take the injectors and put them into a large jar. This is a pain because ther's not much play in the fuel lines. Last time I did this I put one in the jar and the other three in another jar because I was checking the spray pattern and it was just easier to isolate one and then move to the next.
Now take a jumper wire and connect the #5 and #7 fuses. This runs the fuel pump. Ignition does not need to be on. You will hear the fuel pump if it is working.
When the pump is running lift the air flow sensor plate and you should get fuel spraying out of all the injectors. Spray pattern should be conical. Anything else and the injector is dirty or bad.
Check your injector seals while you're at it. If they're pliable they're okay. If they're brittle, cracked or broken in pieces then, obviously, you should replace them. There's one on the injector and another one on the insert that fits into the head. The insert may have come out with the injector when you pulled it or it may still be in the head.
Take all saftey precautions for working around flammable liquids.
Sorry to be wordy and condescending. I don't know how familiar you are with any of this.
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'80 DL 2-door
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