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Engine stutter

Didn't think I would need to post so soon but.....

My 4648 was running so smooth. Suddenly now it runs well until I get the RPMs up and it stutters and backfires. Thought it might be running rich since I could smell gas and occasional grey smoke. Have a Edelbrock AVS2 650 carb and leaned it out. Didn't help. Could it be an electrical issue?

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