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If the tires are oversized this will cause part of it. This engine is carburerated so it cannot compensate like fuel injected cars can. You will notice this problem more during head wind, heavy loads etc.If your tires are oversized you may consider a lighter, regular tire. Good luck. Answer if your bronco is an 89 then its not carburerated. they started putting in fuel injection in 86

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โˆ™ 2008-12-23 23:37:22
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Q: What causes your 1989 Bronco II to jump from OD to drive so often?
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