Better idle when laptop connected?
 

I have an idle issue on my turbo miata. It will idle perfect until I start driving it when coming to a stop light it will idle really rough and die every time. The second I plug my megasquirt into my laptop it starts to idle better

Can you provide some more details on this so somebody can help? Like what is the idle rpm, AFR at idle, fuel source ect. Maybe even a log.

I have had issues in the past with MS with laptops, but im not sure this is it.