The WUR is not getting power. The key must be on for the CIS daisy chain to light up on cold start. Your car would not run anywhere near normal at 2.5bar pressure with a warm engine.
Re-check the WUR electrical plug with the key on.
As the manual states, many things can cause the symptoms you are experiencing; faulty injectors, leaky CSI, intake leaks, sticky WUR b/m strip, and bad karma from the PO. You are improving your karma by working on the car yourself. 
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
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