If you suspect a leaking fuel injector(s) you must remove all the fuel rail hold downs then lift the rail with the injectors still attached (electrial connectors need not be attached). Turn the key ON to pressurize the fuel system but DO NOT crank the engine. Then simply look at the tips for leakage. If you suspect a clogged injector(s) you can crank the engine (electrical connectors must be connected in this case) and watch for one or more that are not spraying fuel.
CAUTION: They will be spraying atomized fuel so put out your cigarette, move the trouble light Do it on a cool engine and don't do it while :drinker