I have a 2001 ford taurus and it was having issues starting yesterday the theft light was blinking then i arched the battery and it started then that night it would go into every gear and rev up but seems to stay in a neutral state is it the transmission which the fluids r good or is it electrical

Have you checked for codes in ECM ? How do you know that your anti theft is causing your no start problem ?

If you have a alarm fob, press the door open button. If the fob isn't working, change the battery in it. If you don't have a fob...well...your troubles start there...need to have dealer reprogram a new fob and use it.

get your battery checked

yes the fast blinking theft light indicates that theft mode is activated. you wont be able to start the vehicle until you have the keys reprogrammed at your local ford dealer.

When this happens, usually the security system needs to be reprogrammed. Ford is known for these issues.

your anti theft is more than likely doing it is their a key pad where you enter a code? If so you need to enter the code that was hard wired to it when you have a bad battery or change the battery the system defalts to the hard wired code, if you don't know the code it should be on a sticker in the trunk I think it is on the hindge to the trunk lid right side!

you have to turn off your anti theft for it to start

you need to lock the doors wait 60 sec then at drivers door turn key to left 30sec then to right

Either you may be using a key that you had copied from the original or your chip went bad in your original key. Most of cars now a days have the key censor in the key so if it is the incorrect key it will not start your car or if it does not read that chip it will not start

make sure battery is fully charged and have tested for a weak cell and check out the alternator and the drive belt and if the car has over 40,000miles it needs a tune up plugs wires fuel filter and if all this fails have the timing checked and don't forget the crank sensor to have it checked