long start engine crank over

[REB]

Help, We have a 2012 Nissan Altima. We've had it since March 2012 and it has been starting fine. Took it in for 2nd oil change and upon starting it at dealership, it took severals seconds of the starter cranking over before it started. Has done it now multiple times since and seems to do so more when it is warm but has been sitting for a while. When if has sat overnight engine cold doesn't seem to do this.
Took it back to dealership and they agree it did it for them too, however they do not have any idea what is wrong. Insisted they call Nissan tech who said they have has this problem reported to them and they do not know what is causing it either. Code is not coming up on computer.
Sounds like a vaccumn issue or fuel issue as once it is started and if turned off and restarted it doesn't do it again, starts right up.
Please please any help out there? We traded in other make of vehicle because of issues and we don't want to go through car trouble issues again. Any help most appreciated.

[sstroudwku]

Check for my reply to your question in the Sedan Forums.