I have a 68 Crown with the 440 and Holley carb. The carb was supposedly professionally rebuilt by the previous owner before I purchased the car 6 months ago, and he provided receipts to verify this. The fuel pump was also replaced. The car has been hard to start from the day I received it, and now has developed a "gallop" or surging at slow idle. When the car sits idling after the engine is hot, it sounds like it has a racing cam in it. Any suggestions on where to start to correct the problem? Thanks for any ideas you have.
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