Will start run 2/3 seconds coughs through throttle body than stops

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Dropped engine and trans, replaced trans (3rd time, 1st 2 times no problems w/ engine) starts runs 15 minutes than stops or will start run 2/3 seconds coughs through throttle body than stops ... fuel pressure 40 lbs, mech timing dead on at 10 degree BTDC, distributor cap and rotor new (less than 2K miles) ? Curtice Wink 301-874-3299 (home office) curtice.wink@verizon.net