hey guys i got a vr clubsport ive just rebuilt the engine im also running a twin throttle setup

ive noticed my car has been blowing alil black smoke when driving it

and also on idle. its running very rich is this how it surpose to be until it gets tuned. im running the motor in at the moment.

also it has been tuned with a laptop for basic tune.theres no vaccum wat so ever on idle. cause its running a big cam also only way it can be adjusted is from the throttles bodies

would i need to adjust it from there for fuel and air mixture

the car goes awsome when its cold once she warms up seems different if using 98 or 95 octane would dat affect it on why its running rich??