70AARCUDA
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A loose dipstick or oil cap can cause a vacuum leak which will set DTC P0171 and illuminate the "Check Engine" light:
• http://www.sandyblogs.com/techlink/2011/09/14l-and-18l-engine-oil-dipstick-and-oil-fill-cap-installation.html
Detailed under GM service bulletin PI0552.
• http://www.sandyblogs.com/techlink/2011/09/14l-and-18l-engine-oil-dipstick-and-oil-fill-cap-installation.html
Detailed under GM service bulletin PI0552.
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