95 dodge Neon. Crank but wont start. I Changed the coil pack and the car started right up. 3 days later I started the car and shut it off, started and shut off, and then the car would not start again. It will crank but wont start again. I am having the same symptom however I do have spark. What could this be? I smell fuel as well.

Primary voltage to several systems, including the ignition coil, dark green wire with orange tracer. That voltage comes from asd relay. There is a fuse for asd relay. To check for voltage the engine has to cranking. The control side of asd relay, the computer has to ground it before it will energize. Did you check wiring circuits for cam and crank sensor connectors before replacing sensors? Are there any applicable trouble codes?
Are you ok with testing wiring circuits?

Possible ASD relay? This is an auto shut down feature for many dodges and can cause a lot of problems. Ensure all fuses are good as well. Just swap a relay from another position into the ASD spot. Use a relay that is not used to start the vehicle.

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97 neon dies while driving - Discussion on Topix

Take your foot off the throttle. Holding the throttle while cranking the engine will prevent the car from starting. The car does not need to be "primed" to start. Other than that, check the coil pack by removing any spark plug wire and placing it on the nearby metal surface. Have someone crank the engine. DO NOT TOUCH THE WIRE ON THE LONG END!!! You will get a nasty shock!! If your coil pack is okay, you should be hearing a "pop-pop-pop!" and seeing a white spark coming from the wire and hitting the engine. I will give you more info later.

do you have fuel,spark, and injector pulse? if not cam or crank sensor

Change the cam sensor. I had the same problem you did and once i change this little sensor, car started right up!

Check to see if you have pulled on the crankshaft sensor and it has come away at the plug.And do the same at the coil pack.

Might as well try the idle air control valve, or the mass air flow sensor. Sounds like you've almost hit them all!

check fuel system if crank sensor was it you wouldnt get it crank.check fuel system.

This sounds like a ignition module problem or maybe the crank sensor.