Have to admit I'm stunned, if the car seems to run perfectly it has a problem? I have much to learn. I thought I was finished but it seems I've just begun. My thanks to Bob Zilla and DMC Joe, I will re-evaluate. DMC Joe wrote: > Les, > > If you refer to D:04:10 of the DeLorean Workshop Manual you will see the "action circle" of the Lambda Control System. The constant idle speed system reacts to this cycle and varies the idle speed in direct proportion to the change in air/fuel mixture. > > Under ideal conditions (all systems operating to factory specification) the idle speed will oscillate during warm up. No oscillation during warm up is an indication that something is not at "spec". >