A Loose or worn gas cap may cause Check Engine Light to illuminate.
Car problem reports
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Most reported 2003 Chevrolet Tracker problems
The front struts may show signs of wear, or be excessively bouncy ride at freeway speeds. This may begin to occur at around 75,000 miles.
the vehicle shuts off when driving ,sometimes starts right back up, sometimes you have to sit 5 to 15 minutes before it will start, it cranks but will not always start up in till it sits, I can not find any bad grounds or any bad wires.