Another way, which is the way I did it, but time consuming, is to get an extra LS injector plug and Make sure it has long enough wires. I would have the injector off, spray a little carb cleaner in it, then hook up one wire to negative of battery terminal and start tapping the positive wire. Its like you're giving it the same type of signal an injector gets when it's working. You will be there for a while doing all 8 injectors, but if your only doing one, it's not that bad. I did not see anything spray out the first few times, then eventually it got unclogged and a bunch of dirt came out. I put a shop rag on the exit of the injector to see what came out. The process is very similar to this video :
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