2003 Ford Explorer excessive starting

Hi guys! I Have 2003 ford explorer 4.0L flex fuel. I'm Trying to figure out why my car is having an excessive starting when engine cold or hot sometimes and also, sometime it wont start at the first time. I replace my fuel filter every 15,000 mile. I just replace my battery couple months ago. I remember this happen but not like this. Please help me? Thanks I love u guys.