2000 Blazer will not start all the sudden

Hello everyone,
I have a 2000 Chevy Blazer that just died one day and has not started since. When you try to start it most of the time it just turns over and the other times it will start for about a half a second and then die and will not do it again for a day or two. I initially thought I had recieved some bad gas, so I pumped the tank dry, changed out the fuel filter and cleaned the injectors. The fuel pump is running because I tried it with the filter off and it sprayed fuel past the front bumper, so i think it has adequate pressure, but have not ran psi test to see. I then went to the ignition system and replaced the plugs, wires, cap, rotor, ignition module, ignition coil and crankshaft position sensor.
I have looked into the threads about ignition switchs and think that this sounds a lot like it could be the problem, but I am not experiencing problems with the dash light like most of the posts said they did and mine died and never restarted, but most of theirs did run again after they gave it a few minutes.

Please help!! :banghead:

Could indeed be the switch.

Have you checked for spark and the ends of each ignition wire?

It has spark but not as much as I think it should have.

what? How do you know?

I pulled the plug and left it in the wire and had my wife turn the engine over. It had a spark but a very weak one. That is why I turned to the coil. That did not change anything though.

If it is sparking, then it is fine.

There is no way for you to gauge whether the spark is strong or weak from loking at it.