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Had the same year bronco - similar problem. Felt like it was hitting on 6 or 7 cylinders... looked over everything, but in the end it turned out to be a small almost invisible crack in the exhaust manifold. When the manifold is cracked is will either suck or release air (depending on which manifold is cracked) and that will throw off all the info from your O2 sensors and mess up the fuel-air-fire ratio in your motor... which can them make it seem intermittently sluggish or feel like it's missing. Hope this helps.

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Q: 1990 bronco replaced plugs wires distributor cap rotar and it is still missing badly what else could it be?
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