Thanks guys. Car doesn't sit, its a weekly driver. and what should my stft and ltft should be between?

 

Your readings should be within some +/- 5 along most of the RPM range, although you will see short higher values during de- / accelerating and other load changes.

A well balanced car should have LTFT's within some 3 points around the zero.

 

would a bad fuel filter be changing the fuel trims. and can a bad maf sensor change fuel trims?

 

Yes to both.