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99 LT 4x4 with 130,750 miles. Purchased about a month ago, after a tune up it's been great, love driving it.

Hey just had a similar problem on my 99 Tahoe. Was throwing p420 and p3xx codes, thought i needed a new cat. Horrible gas mileage was getting 182 miles a tank. Replaced the plugs, wires, cap, and rotor. Fixed the SES light and mileage went up to 16 city. Not sure if that will help but it's worth...