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Have you tried a new spark plug? Having same problem. It could be one of many things. Plugs, plug wires, distributor cap, rotor, or coil pack. It could also be but rarely, the EGR valve, or a plugged catalytic converter. If you smell rotten eggs in the exhaust, I would change the catalytic converter. Had the same problem it was because of an injector leaking into the manifold.

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Q: Why might a 1998 Suburban have a random cylinder misfire?
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