Are you sure the gas gauge is accurate? Put a couple gallons of gas in and see if it runs fine until you get to 1/4 tank again. I remember fighting a problem on an old 67 Camaro that turned out to be it ran out of gas in my driveway and the gauge was off.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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