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My engine strarted popping last night.

Last night I tried to drive the car, and when I hit the gas it shuddered and made a banging or popping sound. The loss of power was very abrupt. It happened whenever I got on the gas. I turned it off for an hour then started it, and even at idle I could hear a popping noise. I drove home gingerly, and did not notice anything. The engine was running well for the last 3 weeks, although I have been burning a lot of gas. 20 gallons in 100 miles (this is estimated I have a broken speedo cable) I have an MSD ignition, and Holley Carb. Right now I suspect electrical, but I am not sure what to check first.
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