Larger injectors can lead to poor starting, rough idling, and poor gas mileage if the combination isn't tuned properly. I had heads, cam, mass air, tb, etc., on my first mustang. I installed 30's then with no adjustable regulator and it ran very rich and I had no driveability problems. I swaped to 24's, still with no regulator, it improved my gas mileage a little and didn't run near as rich, but still no problems.
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91 single turbo vert
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