I have a Tempstar 5000, A technician was here the last 2 days. Worked for an hour after her left. No heat again.Everything is working but no spark. How can I test the Igniter? Honeywell VR8204 to a control panel then out to igniter.

I do not see a way to edit my previous question. I have a Tempstar 5000.It has a S8600m module.I get an very rare weak spark from the Ignitor, never enough to fire it. If I cycle the furnace and manually light the pilot at the right time,it lights and heats,then after 5 minutes the flame goes out and blowers run.After a while I hear a change and I supply flame to the pilot and the scenario repeats.I pulled the ignitor cable and tested,it is good.I took a automotive spark plug and grounded to the chassis. 1 Time a got a week spark, then could not get it to spark again. I am guessing a module,but I want to know what else I should be looking for.