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Q: skips on 2001 Chevrolet Silverado 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
between 45 & 55 mph if you let off the gas and get back on it the motor seems to skip or bogg down
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Has a Check Engine Light come on? I presume what you describe is an ignition misfire under load, or loss of fuel pressure or volume. Attaching a scantool to the 16 pin diagnostic socket will show codes and pending codes. A good scan tool also provides live data on sensors air flow into the engine and fuel trim figures that could lead toward diagnosing vacuum leaks fuel system or ignition problems.