Checklist for Evaluating Mechanical Condition

[Tallbrad]

What items should I expect a good Porsche shop to be testing when they evaluate ?

My only issue is that the car dies often when in neutral at stop lights and heavy traffic while cold but runs great when warmed-up. When it dies it usually fires right back up if I blip the gas.

Pressures, mix, leak down, location of oil leaks ??? WUR, CIS, AAV ???

Many Thanks.