165 ECM idle question

[Rick Lindstedt <rick@mafb.org>]

Yesterday I was in the driveway looking at Diacom to see how idle was doing 
and setting my TPS voltage.. well I noticed that when the car was in 
Park/Neutral the "desired idle speed" in Diacom read 663rpm but when in 
gear it would go to the idle I had set in the bin file which was 600rpm. 
Any thoughts? So is there a way to change this or is this preset?  this is 
the first time I have noticed this...

Thanks

Rick