Just for kicks if you aren't going to do a pressure test (maybe you did and I missed the results?) just put a towel down, pull the fuel line off the pump and see if it streams fuel out. It still sounds like fuel based on your starter fluid test. While your there make sure your fuel line isn't clogged or crimped. Check the fuel rain for clogs. If fuel seems good at that point then move on. When you cycle the key what does the STVA butterflys do (cycle then completely seat or stand 10% open after cycling)? Since it will actually run, and dies after the "fuel" runs out then it still sounds like fuel. That said what is the power commander or ecu flash situation?