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I have done the fuel rail over bucket and crank test. All injectors gave a good and seemingly even spray pattern in turn as I cranked. I have also managed to measure vacuum going into the MAP sensor reliable. The MAP readings are correct, close to atmospheric. However unlikely it seems that the 4-way connector is leaking. Dont know how, but the connector must react differently to being pressurized (positively no leakage. I have tested it submerged) and being under bursts of vacuum.