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04 Take note of the spring inside the enrichment housing. Both its inherent strength, and the adjustable tension on it, control when the FI unit switches between a lean, cruising mixture and a rich, power mixture. Three different springs were used between ’57 and ’65, reflecting increasing experience with FI and the introduction of more-modern cam designs. Install the wrong spring, or improperly adjust even the right spring, and you could end up with a lean stumble or an overly rich bog when accelerating.