My friend has a 92 Indy 500. We just rebuilt motor. It ran great then started loosing rpm. Can only get 7k. Now it backfires out carbs. Timing seems to be set right. Checked for leaks around block and carb boots. Carbs are clean beyond clean. Fuel pump is working proper. Have good spark. Good gas. It will start and idle great but once you put some juice to it. It will backfire spit and shudder. Any ideas
Snap crackle pop
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