I have a 1989 Dynasty with a 3.0L and I swapped it out for a 1990 Dynasty
3.3L and 4 speed auto trans. My problem is the engine will run for 2 to 3 sec. and die. I have changed everything under hood (wiring harness and computers). The body control module is still the original. I tried changing the BCM and had the same result. 1990 had the factory anti theft and the 1989 does not. I think the anti theft is part of the BCM. Thanks to anyone who can help