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I have an 88 gt 302 with maf swap, cold air, 24lbs injectors,e303 cam it runs rich I was wondering if the stock 55mm mass sensor is causing it to run rich
No not by just looking at it. From my understanding, the computer still thinks you have 19's, therefore the injector pulse width is the same. Switching to a bigger injector means more fuel in that same amount of time, which would cause a rich condition. Have you done the koeo/koer test? That will tell you if you're throwing any codes