Intermittent module, need help

[Royal241]

Ok, here it goes: Westinghouse rooftop (1976, I know old but thats where the $ are), all limits are good, doesnt fire up. I checked for spark, (solid ground to the spark terminal) no spark. Changed module, fired right up. I shut it off and to see it start again...and the MotherFer did not. I cleaned the ignitor, checked for good grounding, voltage to the valve (pilot), everything ok. I even cleaned the pilot probe, as best as I could without taking it off, too old will break apart. I closed the cover of the burner ( it has that vaccum house in there), I hear the spark, but no result. How can I check the gas valve? I have voltage 24v, it just worked moments before.
Any suggestions would be greatly appreciated, here in Boston rained all day and beeing wet to the bone I lost my creative thinking. BTW, there is no ID tag on this thing, and the diagram is mostly whipped off. Thank you!
On the new module I get the code: failed ingnition

[Royal241]

well, thank you for reading, but any suggestions? man I just miss my father. he would tell me to start all over again and never give up. thinking of it I will do just that, hope it won't rain tomorrow. I still welcome suggestion, any, even stupid, because there isn't such. thank you

[Brian_UK]

You can hear the spark but can you see it, is it in the right place?

Solenoid has voltage, does the valve open, is there gas to the burner?

[Royal241]

gas valve didn't open, crazy thing is that it worked at first try. changed valve, works fine, thank you

[Brian_UK]

Glad to hear it, thanks for the update.