2006 Toyota Tundra Truck Surging Between 2100 2500 Rpm Driving Only Tell Does

2006 TOYOTA TUNDRA
80,000 MILES
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My truck has a surging between 2100 and 2500 rpm when driving I can only tell it is surging when driving and it does not do it what i can tell when it is in park but does do it in all gears. It threw a code for the downstream o2 sensor running lean a while ago. Is this a bad o2 or would it be a vacuum leak causing it to run lean which is more likely or am I way off?
Apr 4, 2013 at 3:19 AM
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RASMATAZ
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Go to this walk thru link: http://www.2carpros.com/articles/engine-surges
Apr 4, 2013 at 4:59 AM
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