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There could be condensation in the distributor or possibly a worn camshaft. It is also possible that the carberatuer needs to be cleaned or rebuilt.

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13y ago
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15y ago

You may just need a full tune up including replacement of spark plugs, ignition wires, distributor cap and rotor. Not knowing all the details, a worn out camshaft is not out of the question.

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Q: Why does your 86 K5 Blazer spit sputter and backfire when you accelerate?
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