2003 f150 5.4l eng with auto trans. the eng idles good, no hesitation the trans shifts fine. the problem is when i go up a slight grade that puts a light load on the eng the truck chugs the RPMs are not fluctuating the trans is not downshifting, no engine check lights. at its most severe times it feels like a standard trans in to high a gear for the RPMs is the best way i can describe it. The other problem I am having is the A/C defaults to defrost, I have the digital EATC auto climate controller. if i press the vent button it quickly switches to the vent however if i press another button it switches to defrost the ac works just blows out the defrost. I have checked the vacuum and don't appear to have any leaks, when i pulled the line off the check valve by the battery even after sitting over night it still had vacuun. Sorry for the long post just tried to include all info.

 

WelcomeSound's like a vacuum problem some where!