Your 2001 Chevy Malibu may be chugging while idling due to several potential issues, such as a dirty or failing idle air control valve, a clogged fuel filter, or spark plug problems. Additionally, a vacuum leak or issues with the fuel injectors could disrupt the air-fuel mixture, causing the engine to run unevenly. It's advisable to check these components or consult a mechanic for a thorough diagnosis.
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