I swapped in a junkyard TBI454 into my K5. I know you guys dont like trucks but I bet you know more about these motors than anyone else. I hope you can help. After driving 15-20 minutes the idle will kick down, it will idle too low and then die after a couple seconds. How do I diagnose an IAC problem? Or do I just turn the adjuster screw up a little so she dont die?

Charlo