While removing spark plugs on my 2007 expo, I ran into a issue with #3 and 4 plug( which is the 2 back on the left side if u are looking at engine). I can not get my socket to fit on plug right. It feels like it is on tight then while turning it slips up. This has happened on both the first time I tried to losen and spray them. I though maybe it was debris, so I blew both holes out again to no success. Im using brand new sockets and fitted it to new and the other old plugs I pulled to make sure there is not any free play. Being in the back they are damn near impossible to see down into. I do not think they are striped unless they was messed with before I bought it with 60k miles on it. The plug seem to be the original ones. If anyone has any insight into this I would Greatly appreciate it . This situation is stressful lol I am not a certified mechanic in any form but I know my way around cars.