Redbeard00 could be on the right track...an aftermarket security system or a passlock bypass,( for a remote starter), would have to be reprogrammed to match any new passlock learned settings. Just experienced this myself,( previous owner had a bypass installed and I didn't know about it untill digging around in the underdash wiring looking for a convenient place to test the signal coming from the keylock tumbler. simply removing it did the trick)!!
When your theft deterrent module gives you problems.try using another key the other key could be worn. if the other key does the same thing .the dealership.will replace the theft deterrent module.with new keys.and reprogram it.its not a home fix.and it is little expensive.
It honestly sounds like a defective ignition switch. Is the security system factory or aftermarket.
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could be a security problem with your key.
in old astro vans the key has a code it sends to the PCM and Key Reader. if the Reader thinks the key is fake it wont turn the car on. if the PCM thinks it'f fake it will start the car then shut if off.
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