I snapped a spark plug in my 88 300zx a few years back. After my heart started beating again, I called a mechanic buddy and he said to get an easy out and stick the 3/8" square drive end into a suitable socket (electrical tape helped to ensure a snug fit. Attach a socket extension. Then, tap the "chiseled" end into the remains of the broken spark plug until it bites, then slowly and careful use a breaker bar or rachet to break it loose. It worked like a charm!!! After that fiasco, I used dialectric grease every time I repaced plugs. Good luck!

p.s. I believe the easy out size I used was a 6t-4

__________________
1987 300e "200,000+ and going strong"