i recently installed a used stock fuel pressure regulator. i have the stock maf back in. and i have stock injectors. i set my high and low slopes back to stock (28.8/19.64). the kamrfs were around 1.15. i have lowered them both gradually. the high slope is now 17, low is 26. it is still lean, but not as lean. i am thinking it must be one of: (1) fpr is bad (2) fpr was dirty or rusty, injectors and/or fuel filter are now clogged (3) vacuum tube from intake to fpr is not very tight, not enough vacuum any other thoughts?