Did he tell you what the codes were? I need to know what the P code numbers were to tell you what they might mean. And the codes for a 99 5.7L are HORRIBLE for telling you what the problem actually is. RARELY have I seen them throw a code for a bad O2, the ywill normally throw a misfire code when an O2 sensor fails. If there was a P1870 code in it, then the valve body needs to be done first before you go any furthur.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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