caddycracked

i have just got my 2.0l 16v (1994) corrado and it is very poor to idle when cold .it will not idle at all and will cut out if you dont keep your leg on the pedal untill warm and then it's fine.it drives good with no other running or cutting out issues.i have changed the plugs/leads/ cap and rotar with no joy .i am new here so i hope you may be able to help me out thanks john.