Is the glow plug relay behind the fuses? If so which one is it? If I have to replace the glow plugs is it easier if I remove the intake manifold? I hate to break one of those in the head. Does penetrating oil before removal worth trying,and finally where and what kind of glow plug should I use?
Thanks
Sixto the clunk I felt must have been the shifting of the tranny, found the broken vacuum line fixed it and solved one problem.

Wondering if I should just replace all the glow plugs...
If I remove all the injectors can they be cleaned? 115,000 miles
carmen