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Check the simple things like the wiring to all the sensors around the intake and throttle body area to make sure they are connected well. Check the rubber intake hose connecting the lid to the throttle body and look for tears or rips that could let air sneak in past the MAF and throw off the computer. EGR could be acting up as well or could even be a loose plug wire or plug.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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