My buddy recently purchased a 93 F150 with a straight 6. He is on his 3 set of Plugs now because they keep backing out. He says they are in there tight and doesn’t want to put more pressure for fear of breaking the plugs. Is this a common problem of does he need to go to the gym and lift some weights?

 

Head for the gym!!! On a six using a torque wrench is easy. He needs to use one and make sure no dirt and crud is under the plug seat!!!!