starting

[E150GT]

I'm not sure if I'm worrying over nothing but it seems when the temps outside are about 50 degrees f my car will start on the first try. When the engine has been warmed up it will start right up,but if its anywhere from 70 to 100 degrees or so outside and the car has had time to cool the car takes two or three cranks to start. It's not hard to start, just two more cranks than I think it should. should I start replacing the ovp or looking at other more serious issues?