Ignition problems

I am desperate, which is why I am trying here. I have been trying to troubleshoot ignition issues for at least 2 years now. I have created a brand new method from scratch, new digestions, several replacement parts for a brand new PFA intro system, D-torch and several new regular torches. The machine has a new oscillator and power supply. It has a new temperature sensor and I have had to have Spectro go into the software to update 2 chipsets for carbon and lithium. Now I am being replaced because I cannot figure out why this machine won't stay lit. It will light for one sample and then start popping. I have made sure several times the intro system is good and tight. Spectro has checked for leaks.. we have changed regulators. We have tried changing air flow through the exhaust. What am I missing?
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