Back when i had the VW's they always had issues with the coil packs. Be super careful with them. Place them on a towel on the ground and carefully wipe them down and even use some compressed air to clean them out. I have no idea why the build quality of German coil packs is so bad but just be super careful. Also before i reinstalled them I also use to dab a little bit of dielectric grease on the tip of the spark plug to ensure it was making full and clean contact with the coil. I also pushed some onto the prongs that went into the coil from the engine. This was to improve connectivity and reduce resistance and hopefully to prevent any little bit of rust from screwing things up.
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