Trouble Hot Starting

[familycar]

Hey there im new to this forum but I have a question for you all I have a 2003 XR6 turbo that I bought second hand last year only had 60000km on it when I bought it was used by a local cocky to drive into to town once a week for the groceries and that. It starts all good when first started in the morning however if I drive it then park it up after about an hour or so of sitting I am finding that it doesn't want to fire first time usually have to let it crank a bit then it fires up or crank it once then do it a second time to get it to fire up. Have noticed that once it does fire it sounds a little rough and can smell a strong fuel smell and noticed a bit of black smoke from the exhaust then once it clears it runs fine and then you can turn it off and restart it normally its like it is over fuelled/flooding on start up. Have not done anything since I bought the car except changed oils fuel filter air filter and spark plugs. Car has got 78000km on it now. Has anyone else had this drama before and also any information on how to conduct an ECU self test would be appreciated.