I have a 2016 XC90 and replaced the sparkplugs with OEM at 40K miles. Recently, I'm getting a Cylinder 1 misfire code only during a cold start. Otherwise, it runs fine. I swapped the ignition coil with Cylinder 4 to test if its a bad ignition coil and still get the Cylinder 1 misfire. The trouble code only comes up once in a while on cold mornings. I have no clue what would cause this trouble code trigger. Could the sparkplug gap be off or a gad plug? The Volvo dealer parts manager said the OEM plugs are pre-gapped.