One problem related to gas recirculation valve (egr valve) has been reported for the 2008 Jeep Liberty. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Jeep Liberty based on all problems reported for the 2008 Liberty.
Sudden engine acceleration incident. My wife and I were leaving a parking lot. After backing out of my parking space I drove for about 1 minute to a stop sign. I put the manual transmission in neutral and waited for a car to exit the intersection and for some pedestrians to cross. Suddenly, without touching the accelerator, the engine began to race. I looked at the tachometer. The engine that normally idles at about 600 rpm was running at 2500 rpm. I sat at the stop sign for a few moments and decided the throttle must have stuck. With the stick shift in neutral I tapped the accelerator hoping to unstick the throttle. The engine roared to 3500 rpm and stayed there for 10-20 seconds. Then the rpms started to drop back down to normal idle. . Weather was clear and dry temperature 60 degrees, time 3 pm. It was scary. If the transmission was in gear when the engine took off, I would have taken off. I'm afraid to drive this car.