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Originally Posted by Z Factor
If you are already fed up with pulling the plenum then I'd say replacing all 16 is the way to go despite the added cost. If however you want to save money or don't mind another possible plenum pull then only replace the one/s you find that are faulty. I say this from experience since I had one leaking injector a couple of years ago and only replaced it. I have not had any others fail, so I am happy with my decision. If however another one went out within a few months then I would feel the opposite. 
As to the cleaning, many (not all) have had problems not to long after spending the money and eventually had to replace them anyway.
So try to keep your chin up and hopefully you will get everything squared away soon.
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Well, I do know my problem is on the primary side. Is there a way to isolate it to one specific injector? Being a pre-OBD2 car, can a Tech 2 scantool find the problem on a specific cylinder?