Advice please ! 4.3 mercruiser no spark

[vernonbluewater]

Thats how it started , run for 25 seconds, stall , then start right back up. Now no start at all.So- pulled fuel tank line, strainer @ bottom is clean, replaced fuel filter,replaced oil pressure safety switch checked power to fuel pump & visual pump test, gas squirting into carb on throttle pump. Next - no spark @ plugs! Ran through thundervolt IV ignition system checklist. Spark from coil to ground, replaced ignition sensor in distributor & cap/rotor anyways. Next is either coil $75 or ignition module $450 . Any advice would be greatly appreciated ! It is a 1993 4.3 mercruiser LX alpha gen II Ser No F068189. 4bbl carb, Thanks!