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Perplexed...have a 75Fj 40 with a SBC 350 and projection unit, two questions:(1) reving the engine to 5000 rpm will only happen when I go slow if I punch the peddle the engine sounds like its loaded down and sits at 3200 rpm and won't budge but if I allow it to rev slowly its fine, the only new component is a smog pump, checked distributor and pretty much have it targetted to the smog pump but can't figure out why? (2) Are smog check valves when disconnected from the air pump supposed to have vacuum or is this a sign that their worn, I wouldn't think so....thanks
 
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