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Q: Had rough idle and Type A misfire. codes p0303, p0171, p0174. on 1997 Ford Expedition

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First off Im a diesel tech cars are not my specialty...

I had a type A misfire (flashing CEL). Pulled the codes and found p0303, p0171, p0174. Fuel trim was in the 38%, found broken pcv elbow. Replaced it cleared codes, but now I have a stumbling off idle to roughly 2K rpm, and lack of power under load. Fuel trims are down to roughly 8% at ST Lt is roughly 10%. Tested EGR valve by applying external vacuum and it will stall the truck with vacuum applied. No codes are present at this time, no pending codes either.


Truck has new pcv valve, elbow, and fuel pump, cleaned the MAF, Top end and injectors.

Will the KAM cause this issue?
do I need to do the relearn procedure?
(2) Answers
(1) Comments
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look at pcv hose from under throttle body very common to have vac leaks at that hose,can cause all three codes
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