Mine was doing this, i got a 1.8si 115ps version, 1 wivout efi! i took the idle control valve its under the throtte body, complete arse to get of, then once of sprayed shitloads of wd40 in side it, i mean soaked it, poured it out, do this 2 or 3 times! then put it back on, worst than getting it off!! , start it up may run a bit funny, take it for a good run rnd the block it sud start to idle better, mine did neway!!!

Cheers
Pez