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If you're saying it started that after you replaced them, then of course, you need to check all the work. Are the wires seated correctly on both ends? Were the plugs the correct ones, and properly gapped? Were they tightened to the proper torque? If you're saying the rough idle is what you were trying to fix, then at least you've probably ruled out ignition. Next, you might consider the fuel system (dirty injectors, clogged filter, Throttle Position Sensor, etc); the vacuum system (leaks from loose or deteriorated hoses, etc.); or the EGR system (stuck or leaky valve, sticky solenoid, etc.). If you're getting a service engine light, it may be time to get the codes and see what they mean.

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20y ago

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