Oldsmobile Cutlass Supreme intake manifold gasket replacement causing persistent high idle at 3000 RPM on Oldsmobile Cutlass Supreme

Some Oldsmobile Cutlass Supreme owners report experiencing a persistent high idle at 3000 RPM after replacing the intake manifold gasket, often attributed to several potential issues. These owners have noted that vacuum leaks, particularly in the intake manifold gasket, can lead to elevated idle conditions. Additionally, carbon buildup in the throttle body or idle air control (IAC) valve may contribute to this problem. Some have found that a faulty or sticking IAC valve can also result in high RPM at idle. Furthermore, issues with the throttle linkage, such as sticking or failure to return to the normal position, can exacerbate the high idle situation. It is crucial for owners facing these concerns to conduct a thorough inspection of these components to effectively diagnose and resolve the issue.