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Replace that O2 Sensor, when the sensors preheater goes out that can cause a "lean" condition. Another thing to check is your vacuum lines and systems, make sure they are all in good condtion and connected (to much air will lean out the fuel mixture. Last check the fuel pressure, if the fuel pressure is below the proper limits that again can cause a lean condition by not allowing proper amount of fuel to enter the cylinders (most likely items would be the fuel regulator or fuel pump being weak).
 
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