I have a 77 cj5 with a 304ci and an edlebrock 600cfm carb with off-road needles and springs and have noticed at highway speeds the jeep lacks power and vacuum is low and it also misses or seems like it isnt getting fuel. The jeep runs fine at low speed other than a occasional backfire. I dont know a whole lot about carbs and vacuum systems so any help or advice is appreciated.
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