Question about 1999 Chevrolet Silverado 1500
Wont help but taking that cat off will also if your running rich truck needs less fuel more air check air filter....cutting that catylitic off depends on where u are check the law.....but that will improve mileage alot ...so would dual exhaust....BTW all the O2 sensor does is tell u when its out of wack so cant see it being the problem if no engine light warnings...
Posted on Mar 19, 2011
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Posted on Jan 02, 2017
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