Chevrolet HHR engine hesitation and sputtering when accelerating from a stop on Chevrolet HHR

Some Chevrolet HHR owners report experiencing engine hesitation and sputtering when accelerating from a stop, which may be linked to various issues such as problems with the fuel system, ignition system, MAF sensor, or catalytic converter. Additionally, slow acceleration can arise from factors like a clogged air filter, dirty MAF sensor, clogged fuel filter, fuel pump malfunction, faulty oxygen sensor, dirty throttle body, worn spark plugs, or a clogged catalytic converter. Many owners describe engine hesitation as a lag or delay in response when pressing the gas pedal, often feeling like the engine is "missing" or losing power momentarily. It is recommended that owners experiencing these symptoms consult a professional mechanic for an accurate diagnosis and effective resolution of the issue.