I may have misdeed some devious suggestions. you said you added a new radiator . The new radiator you installed might be a little thicker than the original and if you are running aftermarket inter cooler the thickness has a lot to do with your cooling . If your block was machined this is...
take the banjo bolt out take it to any part store or the cooper washer or washers have them match them up. inspect the line carefully around the banjo bolt contact area. follow the torque specs.
usually the line does not leak. the bolt that attaches the line has two cooper washers. there might be one cooper washer or both cooper washer missing. or not torque enought.
sure this might be the problem. the reason is the mass air flow tells the ecu the amount of air entering the motor any brake before the intake manifold is trouble.