Stalling, hesitation, and sputtering when under a load.

[fordguy992002]

hi my wife has a 2001 explorer sport trac with a 4.0 when its cold in the morning it stalls and rund rought for a miniut or 2 then its fine but wile driving every time you take off it runs like crap its like it missing then smoothes out when u get going and it sputters when under load like going up a hill im thinking it is the coil pac but not sure anyone else have this problem and i put my snapon scanner on it today and there is no codes and everything test fine fuel pressure is fine vacume is fine

 

[Mirge]

Welcome to the boards!

I immediately suspect intake manifold gaskets. Might wanna pull the plugs to see what they look like as well. And check ignition wires with a multimeter.

 

[jaylawother]

I just fixed mine today. It's either the mass air flow sensor which is easy to fix or the vacuum hose

 

[Sams01XplrSprt]

welcome

 

[BrooklynBay]

Welcome to this forum! I've moved your thread into the 2001-2005 Sport Trac section. Clean the MAF sensor.