I did an oil change and spark plugs and now my car is shaking at 45 50 mph what could it be ? The spark plugs are gapped and I changed the coils 5 Symptoms of Bad Spark Plugs CARFAX When to Replace Spark Plugs in Your Car Advanced Spark Plug Diagnosis Reading Combustion Conditions A spark plug is more than an ignition componentit is a direct combustion indicator. Electrode color, deposits, and wear patterns reflect airfuel ratio, temperature,
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can bad spark plugs cause vibration when accelerating What Are Basic Bad Spark Plug Symptoms In A Car?