03expoEB

i hav a 03 expedition, about 2 weeks ago the check engine light came on but it would only be lit for a while. The light is always on now and the truck is shaking and when im driving the check engine light starts to blink and the a/c stops throwing cold air soon as the light stops blinking it throws cold air again. The truck is not idling the way it should be....I took it to autozone and they game me a couple of codes but i tought id check before i did anything to it see if this has ever happened to anyone. The codes i got were p0302,p0171,p0316

Bert

Start with the P0302, cylinder #2 missfire. Have the plugs been changed? It can be a coil pack. You can switch it with another cylinder and see if it follows.

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Bert