I have a 91 cutlas supreme V6. It died on me at a light and now it wont start the plugs are not getting a spark we have replaced the computer, ignition module and coil packs! Please helo us figure out what is wrong we are stumped!

Crank and Cam sensors should have been checked before you replaced any of this.

hmmn the Crank and Cam sensors is this an internal part? how would i go about checking it?

Get a scanner on it and see if you have cranking rpms, if none suspect the cps rear of block lower r/s, all the fuses are ok?

Yes all the fuses are okay that was our first check!

Get a scanner and see if you have cranking RPMs, as Maxwedge said. If you can't find one, and REALLY REALLY try to-then you could replace the crank sensor with a junkyard one to see if that's the issue.

Crank sensor is located behind Harmonic Balancer (Crank pulley)

Invest in a repair manual! $15. Typically.