Question about 1998 Audi A6

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Audi 90 1989 2.4e

G'day,
this audi either will not idle on startup without pressing the accelerator or idles rough missing and a big hissing sound round the intake manifold.
Q is there a cold start hole or something that makes this hissing noise or do you think its the gasket or a crack in the intake? I haven't found a workshop manual yet before I start dismantling this thing and discover the problem, only had this car one day as yet but need to get it ready for roadworthy and a car that stalls on the road as soon as foot comes off the throttle will not pass roadworthy. Engine runs fine once under throttle.
Cheers Neil

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