lt1 nitrous question

[KENNEBELL2.6]

My brother just put a 125 wet shot on his T/A. Its a 94 with 40k. I put ngk tr6's in it and it was fine. He just drove it back home from Michigan to Virginia and it was good the whole way. Now he's home and has hit the spray 3or 4 times and the plugs are wasted again. Any ideas or does anyone know of any good shops in Virginia? Maybe the plug gap??

 

[1BADAIR]

wasted as in fouled? nipped?
does he pay any attention to bottle pressure, pull timing?

 

[BIGCOWL-IMP]

Which nitrous kit is it ??