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I have a 1999 Toyota Corolla took my car to the shop they replaced the spark plugs, air filter. And oxygen sensor They said they check all wires but it is still running rough and gives the code P0302 Cylinder2 Misfire detected and P0171 System Lean Bank One. The check engine light is on and flashes when I try to accelerate also I have lack of power when I put my foot on the gas The people at the shop couldn't find what it was?

Vehicle: 1999 Toyota Corolla

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When Toyota sets a lean code condition, as well as a misfire condition, When ever there a misfire the fuel trim becomes lean, and why would it need to set a lean code? The lean code and misfire. That because there is more than likely a headgasket  involved, this is where combustion is entering the cooling system

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