What color is the light, this sounds like the emission system warning light.
that is the engine emission malfunction warning light, and no 99% of the time u will feel no change in the way the engine runs. go to any Kragen or Autozone and ask them to run a trouble code test on your truck, it is free, right down the code they give u and post it back here, there are over 100 trouble codes that can turn this light on.
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just the standard engine warning light and it is yellow
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