2010 F150 lariat 5.4L. Daily driving, short jaunts no issues. When I travel interstate for several hours, stop for fuel. She is hard to start. I have to floor the accelerator and when she does start I have to feather that accelerator to help keep it running. Usually takes about a minute then she runs fine. She has new plugs and coil packs. The only mod is cold air intake.
Please help.

 

How long has the vehicle had this problem?

 

Just bought it two months ago.

 

There re a few things that should be checked.
Might be a good idea to start with having the vehicle checked for any codes. Might be something there, maybe not,but that is as good a place to start as any.
There could be a fuel system problem or maybe an Emission control problem. Diagnosing over the net is really not a good thing to do.
A good shop with a good tech will have some idea where to start checking since special tools and knowledge will be required.

 

Thank you for your reply. I will start with checking for codes (I have not gotten any check engine lights).