One problem related to engine has been reported for the 2003 Chevrolet Silverado 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Chevrolet Silverado 1500 based on all problems reported for the 2003 Silverado 1500.
Vehicle was idling poorly, it had a rough idle that would shake the vehicle. This came and went, it was not a constant problem but slowly grew worse. It was diagnosed that 4 of the eight cylinders, one entire bank, was misfiring. The trouble was caused by a faulty oxygen sensor that was dumping 50% more fuel than needed into these cylinders. The sensor was replaced as was the spark plugs which had become fouled.