GMC Envoy stuttering and clicking noise before shutting off at 75 mph on GMC Envoy

Some GMC Envoy owners report experiencing stuttering and a clicking noise before the vehicle shuts off at 75 mph, which may be attributed to several potential issues. These problems could stem from a clogged air filter, dirty mass air flow sensor (MAF), or clogged fuel filter, all of which can negatively impact engine performance. Additionally, issues with the fuel pump, faulty oxygen sensor, or worn spark plugs may lead to engine hesitation and stalling. A clogged catalytic converter could also result in poor acceleration and engine shutdown. Furthermore, problems with the throttle body or transmission fluid and filter might affect smooth operation at higher speeds. To diagnose these issues, it is recommended that owners check for any diagnostic trouble codes, monitor specific indicators such as engine speed and ignition voltage, and inspect the intake manifold fasteners for vacuum leaks. Addressing these potential causes systematically is crucial for resolving the stuttering, clicking noise, and engine shutdown concerns in the GMC Envoy.