Engine Performance problem
1997 Ford F150 V8 Two Wheel Drive Automatic 170000 miles
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I took it to autozone and they did diognostic
it said o2 sensor I replaced both (nothing )
then a retest said egr valve i was instucted it was the egr sensor i replaced it (nothing) then the egr
valve itself (nothing) now it reads after retest
intake temp.sensor, insafitiant flow egr valve ,
system to lean bank 1 , and missfires ,
could it lead back to mass air flow sensor or can someone lead me in the right direction .
thanks