Recently noticed a starting problem.

When the car is started from cold - for example first thing in the morning, or in the evening after work, it starts first time. No problems. But if I start it again 15 mins, or half an hour after a journey, it 'chokes' - and only starts at the 3rd or 4th attempt. The choking sound is difficult to describe, but it sounds a bit like a single prolonged cough - which then dies. Only seems to happen when the engine is still warm. When cold, it starts just fine. Any ideas what could be causing this ? Thanks in advance.

Edited by ah207 on 15/03/2011 at 14:48