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What engine does the Zephyr have, V6 or 4 cylinder?Are you still getting the P1336?
Give me the VIN#. I want to run this past my Ford engineer friend in Dearborn. Also the mileage.
Are you getting the two same codes, P061C and P061D?I cannot see a new PCM cause the same exact codes. I found nothing in Fords database for those codes, but my engineer friend has a bigger database to pull from.
Look into the RF problem with the alternator. Also inspect the harness from the crank sensor tot he PCM. You could also have am ignition coil causing the problem also, and no have a miss fire or rough idle concern. Aftermarket coils will cause this problem. And you are correct about the spark plugs. DO not use Bosch in Ford engines. They have way too low resistance and will cause all kinds of issues.
I am glad you have an IDS. That helps a lot. I am still waiting to hear back from Ford on this one. I should hear back tomorrow around noon. Sometimes it takes a while for them to reply back
But this new information really helps. I'll send this to them also.