Trouble Starting 05 4.4

[bhennrich]

My wife drove the (2005 4.4i) X5 as she normally does today and got home from work around 1PM as she needed to go back in this evening. At 7PM so 6 hours of sitting, the X was cranking like crazy when the key was turned but would not start. She says she tried 3 times then jumped into the E36 and took off. I went and tried to start it with the same symptoms. On my third try I just kept modulating the gas pedal and it started up on the 4th or 5th press of the pedal. Not sure why. Just trying to start checking. With the throttle by wire I know it is most likely not as simple. Checked all fluids and don't have anything odd happening there. I have started it three times in the last hour with NO issues. It is presenting like a lack of fuel but I really don't know. I truly do not want to just start chucking parts at it. Thanks for any input.