Hi guys,
I am working on a 56 cadillac with a 4.8 4l80e combo. The engine is stock except for a holley 300-137 single plane intake and matching 112-588 4 bbl throttle body. the car will start and idle but then dies. The IAC is not responding but I can control it with the special functions in the scanner. the car is also running quite rich (eye watering). the car will also stumble quite bad and die when it goes into gear. the engine was running great when pulled from the donor and the stock tune is being used (with vats deleted and a 2 bar SD conversion). i'm hoping someone can point me in the right direction to get this thing to run properly. current tune file and a logs attatched.
cadillac stall.hpl
2005 van 4.8 4l80e donor speed density startup.hpt