Blowing sound from engine on start up

amy-jolaycock

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Hi there, I am new to the forum and would like some advice!

I have an Audi a1 TSFI Sport 1.4 and on start up the car sometimes makes a weird noise. When it’s been left for about 7 hours and I come to start it the car makes a blowing sound like air is coming out somewhere and it revs higher than normal. The car also shakes slightly and something doesn’t seem right! It revs to about 1200rpm for about a minute and then stops and goes back to the normal rpm. A lot of people say it’s just a cold start but it doesn’t seem normal to me.. any ideas???
 
Almost all models incl a3 does that and most of the time this consider to be normal. but whats the audi dealer says?