is it bad to only change half the spark plugs?

5 Signs It’s Time To Replace Your Spark Plugs

Registered. I wouldn’t expect any real damage, but there is a very high likelihood that he will continue having ignition trouble. It is very likely that all 6 plugs are in equally bad condition, so replacing only half is sort of pointless.

Customer Replaced Spark Plugs And Now It Runs Bad!?

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