Whenever my trooper is in idle, like say a stop light the engine shudders like it's about to kill. While on the freeway it has a hard time switching gears as well as some shuddering and a high pitch squeal. Is it the transmission or an O2 sensor, a fuel injector or a bad vacuum pump? I can't put my finger on it.
May 20, 2012 at 12:44 AM