Buick Rainier engine shakes and loses speed when gas pedal is pressed on Buick Rainier

Some Buick Rainier owners report experiencing engine shaking and a loss of speed when pressing the gas pedal, which may be attributed to several potential issues. Commonly, engine misfiring is reported as a reason for the shaking, often due to worn spark plugs or faulty coil packs. Additionally, problems with the fuel injector, spark plug, or ignition cables can contribute to these symptoms. Owners have also noted that vacuum leaks or exhaust system issues may lead to engine instability. Loose or disconnected air hoses and vacuum hoses are known to cause violent shaking and vibration. Furthermore, issues with the throttle body, such as loose bolts or a bad gasket, can exacerbate the problem when accelerating. It is advisable for owners experiencing these issues to inspect and possibly replace worn components and consult a mechanic for a thorough diagnosis if problems persist.