can you figure this one because i cant

i have an early 98 contour svt and im doing an engine swap with a 99, but after changing the wire harness for the engine, engine compartment , instrument cluster , and pcm . I go to start the car, my instruments light up and my security light goes solid , but nothing . The car wont start. i ran a ground to one side of my starter relay , and can get it to crank , but it just seems like pcm is not letting the ignition fire or something of that nature . ive checked all the wires over and again . checked clutch switch, but i just dont know .

CAN SOMEONE PLEASE HELP ? CAR HAS BEEN DOWN FOR TWO WEEKS AND BOTH CARS RAN BEFORE SWAP