en N Ms
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As I told you, To check and be sure of the spark quality.Your light won't check the spark intensity.
wsmm,Take one of the old plugs that you took out and stretch the gap open to 1/4"ground the base to the head and check the spark.Or just use a Phillips screw driver stuck into the plug wire boot and hold it 1/4" away from a head bolt or plug base.The spark should jump the 1/4" gap and be blue or blue/white. Your light will not tell how good the spark is.