96 no spark

I have a '96 ls that has no spark at the coil

fuel presure is 62 psi

I've searched every page of the forum and still couldn't find an answer to my problem.. soooo.. here's a list of things I've tried

New ignition switch
new ecm
new ignition modual
new coil
new cap and rotor
new crankshaft sensor

the ecm was flashed... and I have no idea what else to look for

any ideas?????
anyone have a wiring diagram????

Double check the wires and terminals to the crankshaft sensor. Rob

sreve... you saved me from having a meltdown.. traced a loose wire to the ecm... bingo... running... now it's running a little rough at idle... thinking egr.. any pointers ??

how are the plugs? cam retard near 0 ? no codes?