What's your problem?I did all these changes to my 1999 Dodge Durango. They are distributor cap, rotor, wires, spark plugs, and pick up coil. My fuel pump is working I also check the alternator and it good and my vehicle still won't start.

Possible bad ignition wire from coil to distributor cap. Possible ignition rotor inside distributor cap shorting to ground. Possible no power to ignition coil

That would be the ignition coil, the part that creates spark at the spark plug. If you follow the electrical path from the coil wire to the distributor cap, and from there, the spinning rotor just under the distributor cap carries the path from the coil wire at the cap's center to the spark plug wires around the dist. cap, and through the plug wire to the spark plug.
The high voltage causing the spark is created in the ignition coil by the engine computer at the precise right moment signaling an ignition module to cut 12 volts current to the ignition coil. This causes the coil to internally build up high voltage which is passed through the coil to distributor cap wire. The computer knows the precise right moment to initiate spark from engine sensors, primarily the crank position sensor and the cam position sensor.

your rotor may be cracked or try the ignition coil wire. it may be loose

Check the plug wire from the ignition coil to the distributor cap.
If you haven't already, replace the distributor cap and rotor.
The GM Vortec's have issues with moisture getting inside the cap and rotor and causing problems.

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if you have spark at the distributor end of the coil wire and nothing coming out of the distributor wires then you may have a distributor rotor that has a small hole causing the spark to go to ground to the distributor shaft and not out the cap wires.you may have to take a very close look at it as it may only show as a black or grey track mark.or just change the cap and rotor if its been a while.

Replace the distributor cap and rotor. If you have fire from the coil but not from the distributor cap, you have a bad contact point between the cap and rotor. Replace both and you should be good to go,, if the information that you have supplied is correct.

he pick-up coil/stator assembly is located under the distributor cap, and once the distributor cap is removed from the distributor, just remove the ignition rotor, and then simply un-plug the wire connector to the the pick-up coil/stator and then lift it straight up and away from the distributor, and when re-installing the pick-up coil/stator be sure to align the square tab and the rounded tab on the pick-up coil/stator to match with the distributor housing and with the distributor cap and install the ignition rotor and the distributor cap, and then re-connect the wire connector to the pick-up coil/stator.

When it does this you need to check if you have voltage ( spark ) going to the end of the spark plug wire, but it sound to me like your pick up coil is going bad, pick up coil sit under the distributor cap under the distributor rotor same size as distributor assembly ( black ) cheap$$, good luck, hope this was very helpful.

Remove the distributor cap and look to see that the rotor button is turning,and not stopping,the truck,may have jumped time.The timing chain may hve broke.If not,replace the pick up coil in the distributor.

did you change the main coil and coil wire?if so then check the ing resistor and then the computor box