Some Mazda Navajo owners report experiencing stalling and rough idle issues, particularly when coming to a stop. Common problems include fuel system malfunctions, such as clogged fuel filters, dirty fuel injectors, or malfunctioning fuel pumps, which can restrict fuel flow to the engine. Additionally, owners have noted that cracks or holes in the air duct can allow unmetered air to enter the engine, disrupting the air/fuel mixture and leading to rough idle and hesitation. Vacuum leaks have also been reported to cause difficulties in maintaining idle, contributing to stalling and rough running. Moreover, some owners experience issues with the idle air bypass valve, which can lead to difficulty starting the engine when cold and stalling at idle. Faulty O2 sensors have been cited as another factor, with symptoms including rough idling, poor fuel economy, and a check engine light. Addressing these issues through proper maintenance and timely repairs is crucial for improving the performance of the Mazda Navajo and resolving these concerns.