My 1999 1500 Chevrolet truck with 5.3 engine has been checked with a coder and I get a 171 and 174 could this be due to the MAF Sensor failing . I took the MAF Sensor out and cleaned but it still idles rough and the service engine light stays on. I have changed the plugs and plug wires and set the right gap on the plugs. The truck has 239000 miles on it.
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