try injecting fuel manually and see if that starts
get those injector pulse noids? to test if they are pulsing
the fuel pump shouldn't run all the time in the 1st place so check wiring
check if you have strong spark from coil and spark plugs
check if not sure if this engine have water/coolant temp sender unit? might be faulty causing the ecu to think is very cold.
ALSO
check the air regulator if they have one...take it off when cold see if its fully closed or open