FYI, I do have the tools and about 5 each of the adjustment shims and I performed a valve adjustment on a subscriber's car. I found that the head shop did not do a great job on the valve job and he had to take the car back to the shop that did the valve job and have it done over again only to have to ring it back to me to do the valve adjustment.
On the stall. I think there was a modified control module that helps with the idle.
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM