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Different mag drop after annual


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I recently got my 2006 CTSW back from annual and now notice that on one ignition I get an rpm drop of about 100 and the other is about 50. Before the annual they were both about 50. I don’t notice any other issues, but am curious about this change. Any thoughts on what could cause this?  I do know the mechanic removed and cleaned the spark plugs. 


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Check plug resistances, check plug boot resistances while trimming the wire as roger suggested.

Resistances should be around 5k for each item, and I would probably not allow more than 20% deviation.

Higher resistances can lead to timing shifts, weak sparks, and eventually dead cylinders.

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