No spark at all, missfires, etc.
Make sure it has a good ground and is cooled correctly
Autozone can test them, to a point.
1993 L32 v6 192,000 - GONE!
1996 LT1 v8 60,000 SLP ram air, !air, !egr, !evap, cc503, 1.6rr, pacesetter LT w/ORY, flow master 80, PerformaBuilt lvl 2, 3200 stall, 32# Red tops, Tune by Soloman
1997 LA1 v6 Venture Van!