No ignition

I have a 2000 montana 3.4L, with no ignition. I have checked power going to the ignition module,when the key is turned on it has power for a few seconds then cuts out. I Checked the fuses and relays, all seem to be ok. Im unsure where to go from here. Any help would be appreciated.

Are you saying you have no spark at any of the plugs? Or that the engine doesn't run. Did you check for spark at the plugs, at least one plug from each coilpack?

I have no spark anywhere. There is no voltage coming into the ignition module. I unpluged the power/ground wire going into the ignition module, using a 12 volt test light I test the power wire by turning the ignition key to run , the wire powers up for approx. 3 or 4 seconds then shuts down. It seems like a relay is shuting it down.

I don't have the wiring diagram in front of me, but that seems like the way it should work. The coils won't stay powered up if there isn't a crank signal. You may have a bad Crankshaft Position Sensor.

I checked for millivolts on the crank sensor but am unsure how to read millivolts on my multimeter,it only reads AC volts and AC/mA. In the manuel i have it says to set the meter to AC volts, crank the engine and the sensor should produce no less then 200 millivolts. The reading i get is .300 to .900 volts. i am unsure if its a millivolt when the digits are behind the point.

If you are loosing the 12VDC feed to the ignition module, you WONT have any spark. Check the ignition switch and fuse pannel.

I am also getting advice from Selectron and RahX on the Technical/Engineering forum here and I've covered that, so if you would like to look there and see what i have done so far, any input would be great.

As an Electrical Engineer I can tell you that 200 millivolts = 0.2 or 0.20 or 0.200 volts. Your 0.300 to 0.900 volts is the same as 300 to 900 millivolts.

Then i will assume that the crank sensor is ok.

Yup... I would assume the 7X sensor is good also.