Sometimes it has no power to key sometimes it does and just wont fire

It seems like you have overlooked something.
If you have spark and fuel, it should keep running.
Sometimes the key switch is faulty and you loose spark when you turn the key back to the run position.
You should be able to run a jumper wire to the coil and crank the engine over to see if you are loosing power to the coil.

Almost sounds like a problem with the electrical portion of the ignition switch.

I would suspect you may have a defective ignition starter switch.

Maybe you need new module.

Listen for fuel pump, when cycling ignition key on & off

Check fuel pressure at motor with a gauge

Check for spark while cranking

check for poor electrical connections at the starter and battery check for power at the start wire on the starter should have power when key is in the crank position if it has you need a starter

I would clean the battery connecters or possibly change them. How old is the battery? sometimes when battery get old, they have enough juice to crank the motor but not enough to start it..But then again, if it doesn't crank at all sometimes, it could certainly be a bad or loose battery terminals..Start with this since its the simplest and easiest and could very well be your problem. hope this helps

look at the anti shudder valve (asv) look at pics on net. Its an air intake valve that shuts in order to stop the engine. It sometimes sticks shut. Syptoms are engines tries to fire but then turns over very freely but wont start. If it is this the whole air intake system needs de coking.

Make sure battery cables are tight and posts of battery are not loose

There are many reason why your car wont start.
Check Your Fuses
Battery Issue
Bad Igntion Switch
Bad Starter Connection
Test your ignition coil
Just go through these two link
http://www.ehow.com/video_112584_troubleshoot-car-wont.html
http://autorepair.about.com/od/troubleshooting/a/ts_no-start.htm
Hope these links will help
Let me know
Thanks
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Smith