need help car wont start

[1991s13coupe]

Ka24de/auto/150k

Car ran fine untill one of the injector went out. Got it relpace and thats when car wont start. With the fuel rail prop about 1/2 inch away from manifold you can see fuel squirting from all 4 injectors and the motor will be running. Motor dies as soon as you seat the rail back onto the manifold.

There is spark from all 4 plugs but its yellowish.

Fuel pump is good i got about a 1qt. of fuel coming from the return line (key at the on start positon)

Items I have changed:

*4 injectors

*ignition coil

*temp sensor

*4 spark plugs (cap/rotor/wires all ok)

*starter

*mass air flow

Help...