Trying to take a glow plug out and can't get it out with a simple wrench. The former owner overtightened everything on this car that it's next to impossible to loosen. Any recommendations on what I can use to get this thing out of there? the wrench has come off a few times, so I'm limited on my tries here before I really have problems... I'm going to have to make a run to Craftsman and just need to know what I can get the best torque with and fit into that tiny space. I am refraining from taking the fuels lines off.

Thanks, Lance