Short term rough idle

[Robert Myers]

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Hi Y'all,

My well modified '95.5 urS6 has developed a relatively minor but a 
bit disturbing problem.  On initial start-up the engine idles a bit 
roughly.  The idle smoothes out again after a few (perhaps 10-15) 
seconds and becomes as solid as a rock.  Obviously this is not, of 
itself, a major problem but it could be a portent of something more 
serious to come.  Any ideas/suggestions?

Other than the idle problem the car is running superbly.   Let's 
see...  modifications which might be related...  Running the Dave 
Forgie 1.8t coil mod as expressed by Apikol.  All the RS2 mods - 
turbo, ECU, EM, injectors.  Stromung exhaust.  Big FMIC, etc.

Bob