Trane XB80 doesn't ignite, or give error code

Just wondering if anyone has seen this before? I had a professional hvac cleaning company clean my ducts, and all of the internals of my furnace. The professional showed me that my furnace wasn't igniting on the first try, and generally igniting on the 2nd or 3rd. He told me that more than likely, my inducer fan was dirty and needed cleaning. That same night, my furnace stopped igniting all together, without emitting any trouble codes via flashing lights. It goes threw the 3 try process, then blinks twice which indicates start failure and lockout. Everything seems to work. The inducer kicks on, the pressure switch closes, the HSI glows red hot, the gas valve opens (I can smell the gas) and I get no ignition. I've electrical tested all components, and everything seems good. I'm at the point where I'm thinking the gas line might be partially clogged and not allowing enough gas, or gas in a strait projection out of the line to ignite. Any ideas?

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