runs mint to 3800, then falls on it's face

Fuel pump????? or what....


changed to the yellow secondary spring and it surges during acceleration and falls on it's face at about 4000, dropped it back to purple spring and it did the same, less the surging.....

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84 GT,shorty headers, open dual's, bored .060, 10.5" clutch, T5, 89 heads, edelbrock Performer manifold, matched cam, 600 Holley..