I have the same idle problem without the scan tool connected. The log does say "Yes - ALDL Mode". Can someone look at my log attached to the original thread? (If you can't read the .xdl file, you can download the free scan tool software at
www.tunerpro.net. For the definition file, I'm using 1D.adx for a 84-85 LM9 3.8L V6 Turbo 20 byte ALDL stream. The required 10K resistor is built into my ALDL cable.) I've noticed the PNP is always in Drive and my 02 sensor (I had it replaced) has a huge range at steady throttle regardless of the speed. The Rich / Lean is always changing too. The car is my 20 year old son's and I hope we don't need "racing" data at this stage of the restoration. Thank you for your help.