one of the un-spoken rules of these forums is that we do not offer expert advise on how to kill yourself or others. these posts for an archive that could be used by your next of kin as a way to punish anyone who was in even the slightest way to blame for an untimely and unfortunate accident.
as you know gas mixed with oxygen will offer an explosive mixture.
in almost every case of your device not working, you have or are expanding and explosive mixture.
the only two possible cases of it NOT creating an explosive mixture are:
1) total failure and no gas being released.
2) perfect operation and gas is ignited and burns properly
what we know :
you have no deep understanding of electronics
you have no deep understanding of gas mixtures
you have no deep understanding of ignition sequences
you have no deep understanding of ignition hardware
not trying to be rude in any way, but the laws and insurance regulations abound regarding this sort of thing.
the most helpful anyone can be here is to help you find a more suitable project for you knowledge level. one that does not have the risk of injury or death.