Mercury Tracer stalling and rough idle issues with intermittent starting failure after ignition switch and cylinder lock replacement on Mercury Tracer

Some Mercury Tracer owners report experiencing stalling and rough idle issues, along with intermittent starting failures, after replacing the ignition switch and cylinder lock. These problems may be attributed to several factors, including vacuum leaks that can lead to rough idling and stalling. Additionally, faulty or improperly gapped spark plugs can cause misfiring at low RPM, contributing to a rough idle. Issues with the ignition coil may also play a role in rough idling, as can problems with the idle air control valve, which can affect overall engine performance. Furthermore, a faulty idle bleed recirculation system, such as a clogged or stuck check valve, can exacerbate rough running, particularly at idle. It is advisable for owners to inspect these components to effectively troubleshoot and resolve the issues.