Having problems with your GMC Cars & Trucks ?
2003 Denali XL code P071/P074 comes on and off the last month
\015 Check engine light came on, code read at Autozone put a can of Seafoam in tank and light went off a day later. Light came back on a week later. Cleaned Mass Air Sensor and replaced air filter, ran MAS cleaner though when running light off. Ran truck for few hundred miles light back on. Changed Mass Air Sensor- no change in light status.\015
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