I couldn't find anything on those injectors either. Before I bought the new injectors I bought an
injector cleaning tool kit from Amazon that worked fairly well using
Berrymans B12 #0117 (the good stuff). The good thing about the injector tester is that I was able to remove the upper intake and the fuel rail with the injectors still connected, slide an oil drain pan between the fuel rail and the lower intake, pressurize the fuel system, and cycle the injectors one at a time to see if they were clogged or if they had a good spray pattern. The Berrymans cleaned the OEM injectors fairly well, but there was still a slight hesitation, so I bought the new injectors and that completely solved the problem I had been having (poor acceleration, bogging, bucking, etc).
Before buying anything else, I would pull the fuel rail with the injectors still connected, and use a shallow oil drain pan, etc, and apply voltage to each injector with the system pressurized to see if all of the injectors are working or not. I forget what voltage to use. The tester just connects to the battery, but it's intermittant (it pulses fast or slow). I recall reading that a 9v battery would work also. The OEM fuel lines to the fuel rail should be long enough to get a drain pan under the rail (I put an old T-shirt in the drain pan so the fuel spray wouldn't bounce off of the pan).
Rebuild kits are available for the OEM injectors if you are successfull with cleaning them.