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That is your fuel delivery valve. From what you are seeing...you need to rebuild the pump. You may have gotten it freed up with the carb cleaner, but something inside wasn't free...now it needs rebuilt.

where exactly would this be? If you flow timed the pump and it didn't help much, then I'll bet the pump itself needs rebuilt. This should have been the first thing you went to before injectors. The fact that you should have been your fist clue the pump needs rebuild. Just because you freed...

Flow time the pump. When you are using the PC mark, you are relying on a pointer bolted to the side of the housing to point to the right location...are you sure it's pointing to the right location or did someone move it a little??? Before you spend money on the injectors, especially if it ran...