'99 chevy silverado 1500 with 5.3 liter engine showing po171 and po174 codes?

littlej_ala

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it has a rough idle when cold. it revs real high then back real low like it is going to cut itself off. if you try to drive it, it will stall for a second like it isn't picking up fuel. it runs perfect when its warmed up except for getting about 14 mpg's.
 
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