If you are still having the problem with the 300ZX.....
It died, and won't start back up. With the no spark condition, you will want to check cylinder compression.
To check compression, remove a spark plug, and put your finger over the hole to plug it off, while someone turns the key to crank the engine. The cylinder should EASILY make enough pressure to push your finger off the hole. If it doesn't, then the timing belt is bad.
The 2 things that cause this problem are timing belts, and fuel pumps...USUALLY.
If you still need help or instructions, just let me know.
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