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Pull the suspect coil and look for ANY signs of cracking, if you see cracks, can it. Test it for resistance (terminal 1 to terminal 15 should read 0.3-0.7 ohms), if it doesn't, toss it. Using an indictive pickup, test each coil for voltagne output on a scope with the engine at idle for uniformity of the voltage wave form; any low peak or irratic peak coils should be canned.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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