I wouldn't spend alot of time on the injector itself. You might want to follow the advice about the signal. Pull it out and see if it squirts during cranking. I would also check fuel pressure. You will need a special fuel pressure tester. Once the car is started and warm, check primary pressure. Leave the gauge connected and shut the car off. Pressure should drop slightly then hold that pressure overnight. If fuel is bleeding down in the system, you will need to reprime the system on every cold start. You may also be having a problem in the idle air management circuit.

Good luck,
Peter

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