Mechanics

, ROUGH IDLE

2002 Isuzu Trooper • 15,000 miles

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.
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Quincey
May 20, 2012.



Check the EGR valve if its closing properly and also the idle air control valve clean it and see what happens

Rasmataz
May 20, 2012.