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Check plug gap, timing, wires, pcv valve or other emmissions component, uneven cylinder compression, ignition coil, vacuum leak at intake, dirty carb or fuel injector. Any one of these can cause a hesitation during acceleration followed by a constant miss, the only thing that is true about a stumble but not a miss is low fuel pressure.

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Q: Why would a 1989 Chevy Suburban engine miss throughout driving speeds but started as a stumble at acceleration new fuel filter dist cap and rotor?
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