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Backfire through Throttle Body on 1989 MJ

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I have a 1989 MJ. Rebuilt the engine. Now 9.4 to 1, Stage 2 cam, 58 mm TB, Pacesetter Header, 19 lb 4-hole injectors, and ported & polished head. At Idle, runs great and sounds even better through Thrush muffler. Accelerate and it backfires through TB?? Any one out there has a clue what to do?

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