codes 1178 and 1176
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I fought with an 1176(lean condition) for almost a year. It is usually vacuum leak associated. And although through normal testing methods, I could find none on mine, I replaced the valley pan gasket anyways. Guess what? Besides the bolts being roughly finger tight(probably the original problem), it got rid of the 1176. It's gotta be close to 2yrs ago now.
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