car starts for 2-3 seconds and dies on 1991 Chrysler New Yorker

my 1991 crysler new yorker 3.3L V6 will start up for 2-3 seconds then just dies. Checked the fuel pump, changed fuel filter, found 2 broken bolts in the manafold (took apart totally cleaned and replaced with new bolts), checked for spark only one plug didnt get spark-replaced it. (while checking each plug for spark the car would run (rough) on five plugs. check engine light binks out code 12. please help with any solutions. Thanks

by in South Lake Tahoe, CA on December 22, 2009
2 answers
ANSWER by on January 08, 2010
A code 12 means a bad electrical connection or weak electrical system such as low system voltage.
ANSWER by on January 23, 2013
If it has anti theft system activated, it will start briefly then computer will shut it down. Deactivate by unlocking either front doors with key, or if system is malfunctioning, you can ground the ground wire running to the theft module(21 pin natural color connector)under the dash above the glove box. I put in a permanent wire with a momentary switch, so whenever the theft system is activated, I can just push it to reset system.
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The car runs 2-3 seconds then shuts off. replaced fuel pump but car still does same thing.