Hi, I really recently purchased a 1969 Dodge promotional NASCAR truck. It has a 2004 5.7 and automatic out of a 2WD pick up. Truck was built 10-12 years ago and stock wiring and PCM were used. It’s kicking a bunch of codes, stalls, and tranny will just shift with what feels like first and 3rd gear( limp-in?). After you clear the codes, it runs better and shifts good for a little bit. The exhaust was redone before I got it, and there are no cats and O2 sensors are gone. Original builder stated that it had cats and sensors when built, along with stock PCM. Truck also has a mild cam, shorty headers, and what appears to be an early MP carburetor type intake with stock injectors and an adaptor to mount stock throttle body to carb base.
What I’m wondering is if there is a better way to go with wiring and PCM than chasing down all the codes and deciphering someone else’s wiring. Thanks for any help or ideas. Jim

Sorry for upside down pic, not sure how to fix that, either.