Q: Q: Check engine light on again

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I have a 2006 gmc truck that has been regularly maintained. I replaced the mass air flow filter last Dec., was smogged in Sept.(passed) and 3 days ago replaced the cannister purge valve now the engine light is on again is this a problem in gmc trucks? What is the worst thing that can happen if the light stays on or continues to have problems with the evap system??

My car has 70000 miles.
My car has an automatic transmission.

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