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Pull the plug wire on number one and ground it to the valve cover to check for spark. If there's spark and the plug is good then has to be the injector. There's no need to pull the fuel rail. If the injector is getting proper voltage and or the resistance is out of spec then the injector is dead. If it was leaking it would run rich on that cylinder not be completely dead. The power balance test would show a change if it was leaking and the plug would be fouled. My money is on dead injector. Not an uncommon orccurence on these cars. It's happened to me a few times myself.
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