I'm not sure why you started changing any sensors. All your problems apply to misfire issues. The PO304 and PO305 indicate misfire in cylinders 4 and 5. On that engine they have a ton of problems with the individual coils.I don't know how many miles are on your plugs now but i would be replacing the 2 coils in 4 and 5 and all the plugs if they have any age on them. That is no fun job to do on that truck either.

Answered by Wrenchtech (expert)
14,711 answers provided

As for the whistling noise, make sure you have no vacuum leaks but I kinda doubt that because you have no lean codes.

Answered by Wrenchtech (expert)
14,711 answers provided

I have almost the same issue, mine is a 98 expedition with a little over 170,000 except i have a third missfiring cyl. I have not even started into it yet. Could the three missfiring cylenders cause the p1309 code? I will be replacing coils, plugs and wires this weekend in hopes to clear everything up.

Answered by etheger
0 questions asked

Ok, I answered my own question. I changed the three coils and fired it up and I ran like a champ! Yes it was one hell of a miserable job! I was going to change all the spark plugs but might have to finish the rest when the other coils go bad, changing spark plugs isnt like it used to be.

Answered by etheger
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Please start another question of your own. We don't address multiple cars in one question

Answered by Wrenchtech (expert)
14,711 answers provided