1973 450SL 2004 E320 4Matic Wagon 2019 Jeep Grand Cherokee
All of a sudden, my 450SL decided to start missing. Thought a new set of plugs would be a nice thing to do for it. Drivers side 2nd from front plug came out no sweat, but no matter what I do, the new plug binds up after about two full turns. I tried to put in the original plug, but same-o. Any ideas as to what to do? I tried search with no luck.