HAPPY THURSDAY.....WORKING ON 2000 WINDSTAR FROM HELL...BOUGHT USED ABOUT 2 MONTHS AGO..STOPED RUNNING 2 FDAYS LATER..PATS SYSTEM ISSUES...NEW ECM... KEY PROGRAM AT FORD... ALL GOOD..THEN CAME PO171..PO174..NORMAL STALL PROBLEM AT IDLE..I DIDNT ADDRESS THE PROBLEM...THEN OUTTA THE BLUE STARTED MISSING REAL BAD..PO301..PO304..PO171..PO174..PO156..COULD MY LEAN CODES CAUSE THIS??? checked spark...all good...checked injector harness and made repairs. ANY ADVICE??