I hate to ask but i need help on a dodge

[irishrp02]

just got a 1996 Dodge dakota with the 3.9 v6 it starts up and runs fine. But if i drive somewhere and stop and turn the engine off for 45 minutes to an hour and a half and it will start fine but then sputter and sounds like it wants to stall for mabye 15 seconds. if it sits for longer than an hour and a half then it is fine or if i start it up less than 45 minutes it is fine, i just cant seem to find out what the problem is any one have any ideas.

 

[Hahnsb2]

Could be the IAC opening too much, mine did it on cold starts for about 10 seconds with the stock computer, sounded like a lumpy cam. Check for codes?