In the last month or so I'very had trouble with my 2002 Explorer having trouble accelerating. When I take off from a light it hesitates badly. It feels like it's got air in the tank. It does it every time I need to accelerate, including coming around turns. I'very put in fuel injector cleaner and it works fine for a little while, but then has the same issue. Yesterday morning it wouldn't turn over in the morning. I changed out the battery, but I had a similar issue of not turning over. It eventually did. I was wondering if the two might be related. Could it be a fuel pump or fuel pump relay? I'd appreciate some advice. Thanks.

 

Your engine performance issue could, but probably is not related to the starting issue.

 

You should check for Codes...