Perform the 6 P's here: http://www.twinturbo.net/nissan/300zx/forums/main/view/922678/The-6-Ps-Proper-Preparation-Prevents-Piss-Poor-Performancegt.html What brand of 740cc injectors? Also how are you calculating fuel mileage? You need to be using the trip meter and calculating based off how much fuel you put into the tank from the gas receipt.
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