My anti theft system will not shut off now i cant start my 1998 grand marquis

Question edited for clarity.
Question moved to model category.

That is a lot of items changed for nothing. The flashing anti-theft light was telling you the answer.

Key

1. Insert the key into the driver's side door lock.
2. Turn the key once, but not all the way to unlock the door. Leave the key in this position for 40-60 seconds. ...
3. Do this again, but turn the key in the opposite direction.
4. Remove the key from the door, get into your Ford, and start the engine. The system should be reset.

How to Reset the Anti-Theft System on Your Ford

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And also this!

https://www.crownvic.net/ubbthreads/ubbthreads.php?ubb=showflat&Number=3731914

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What alarm ? Or do you mean anti-theft system . What's wrong ? Car won't crank over , or won't crank an start an run .

Does the anti-theft light flash really fast when trying to start the vehicle ? Learning how to test the systems rather then going by i was recently told it could be this or that . I say your best bet , have it towed to a qualified repair shop . Because if it is the anti-theft system ,your not going to be able to do anything with it .

If is the original key fob, you may need to reprogram it

Yes. But I wouldn't recommend it, as on modern vehicles the anti theft is linked in to the alarm, ignition and the gearbox on Automatics. It could also be an important part of the ECU. If it was easy then cars would be stolen with even more regularity.

I have already gone into this.

disconnect the anti theft system

if it was fitted correctly in the first place you will not be able to take it out without a total rewire.
thats why its called anti theft.......

if the vehicle starts then stops and the anti-theft light is flahing you may need to re-set the pass-key system to do this you will need to atempt to start the vehicle and when it stalls leave the key in that position and watch the anti-theft light. it should flash on and off for about 5 to 10 minutes. when it stops flahing turn the ignition to off then try to restart your vehicle