Strange behaviour at start up

[Sudsy]

G'day all, I have an ecu that came out of a stock VT with LS. I bought the car for the motor and trans and drove it on and off the trailer and up and down the road when i first got it. I read the ecu and saved the file then i deleted the vats and saved it to the ecu. Did a compare in tunerpro and the only difference i could find was the vats as it should be. I lent the ecu to a mate that was having trouble with idling on his vy after a cam swap just to see if made any difference. This is where the strange thing is. Crank the motor and it fires but stops cranking on it's own and apparently over fuels (i wasn't there so i don't know exactly). Has anyone seen or heard of the starter stopping cranking on it's own?

Cheers