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If you have headers and no cats in the y-pipe, have you had it tuned? It sounds like it's running really lean and it could be the catalytic overtemp protection trying to warn you or it could be a legit lean condition. Have someone scan it while you're driving to watch the fuel trims and O2's. I wouldn't assume the O2's are bad. Sounds like a really lean condition overall.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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