Jeep Compass unable to exceed 40 mph with erratic RPMs on Jeep Compass

Some Jeep Compass owners report experiencing issues with their vehicles being unable to exceed 40 mph accompanied by erratic RPM fluctuations. These problems may stem from a vacuum leak, which can cause air to be pulled through faulty seals or gaskets, leading to an imbalance in the air-fuel mixture in the combustion chamber. Additionally, some drivers have noted a lack of power when driving uphill or around 40 mph, which may require adjustments in driving due to power and tuning concerns. Owners also report encountering extremely rough idles with fluctuating RPMs, especially when the AC is on or the climate control is set to defrost. Furthermore, the idle RPM can vary significantly, influenced by factors such as cold starts and ambient temperature, which can range from over 1500 RPM on cold mornings to as low as 800 RPM when fully warmed up. It is advisable for owners facing these challenges to check for vacuum leaks, assess power issues, and monitor how AC usage affects engine performance.