Guys I have a well maintained 2005 Ford escape with almost 215 k miles. I have recently replaced spark plugs, valve cover gasket and they car runs good interms of no hesitation or shaking.

I have noticed for few years it seems like it struggels going up the hills or just basic acceleration. No obd codes and otherwise runs great.

I have used fuel injector cleaner so far but not sure how to boost some power out of this engine. It doesn't consume any oil.