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Van made a loud pop like a backfire and the engine died on 1990 Chevrolet Astro

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We have replaced the Pick up coil in the distributor, the coil, the cap and roter and the ICM module. The van won't produce more then a yellow spark at the distributer wire 1 x per new try. Almost every thing has been replaced and we are still scratching our heads. We don't have any other Ideas can you help?
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