my 98 5.4l has been acting up lately
first set a p0171 and p0174 code hesitating and missing bad
found the pcv hose vaccum leak now that code is gone (cleared the computer and it never came back)
then have a p0102 (maf sensor/low circuit output) put on a new maf sensor and it still studders and stumbles

there is a funny knocking noise coming fro mthe top of the motor
could the egr valve be causing my miss and funny knocking noise?

any help is appreciated
thanks
nate