I had a reputable shop do spark plugs on my daughters 2008 Jetta 2.5 3 years ago with 129k miles on it. I do keep a log but I forgot to enter this as it wasnt done by me and quite honestly didnt think we would still own this car but it still runs great. Car currently has 162k miles and I decided to do the plugs since I had the chance. When I went to loosen the plugs they were practically hand tight, I honestly didnt think the socket wasnt on the plugs. Mistakes happen and no damage, my question is would this cause a loss of power. There wasnt any check engine lights. The car is primarily used for short trips to the train station 2 miles away. When I do plugs I like to use a torque wrench as I dont trust my skills without one. Here is a picture of the plugs
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