Buick Rendezvous rough idle and loss of power while driving uphill after replacing components on Buick Rendezvous

Some Buick Rendezvous owners report experiencing a rough idle and loss of power after component replacement, often linked to several key issues. These owners have identified vacuum leaks that may have occurred during the replacement process, which can lead to a rough idle. Additionally, improperly installed or faulty spark plugs have been noted as contributing factors to rough idling. Problems with the ignition coil are also reported, causing engine hesitation and further loss of power. Misfires have been a common complaint, leading to both rough idling and diminished performance. Some owners have observed that their vehicle shakes at idle but smooths out during acceleration, indicating potential motor mount issues related to engine torque. Furthermore, diagnostic codes like P0302, which signal a misfire in a specific cylinder, have been associated with these performance problems. For those experiencing these issues, it is advised to check the relevant components and seek expert assistance if problems persist.