2007 Chevrolet Silverado Hi Ve Been Getting Codes P0171 P0174 Regularly Now

2007 CHEVROLET SILVERADO
100,000 MILES
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Hi, I've been getting codes p0171 and p0174 regularly now at idle on my 2007.5 silverado. as well the service traction control and stabilitrak comes on at stop lights. I have a k&n intake as well as a bullydog gt gas tuner and these issues were happening prior to those being installed. The dealer has given up on trying to find whats causing it and I believe Im getting worse fuel mileage than i should be because the engine is thinking it is lean. No leaks including vaccum line and mass airflow sensor has been cleaned and changed. I was just wondering other issues I should look at and even if I could pug off the vaccum line at each end or if this would cause other issues. Im kinda and a last straw here before I dump the truck and upgrade.


Thanks Brendan
Feb 28, 2013 at 5:33 PM
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HMAC300
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check fuelpressure first and then for vacuum leaks if fp is ok. fp should be 50-60 psi if below that replace pump and filter.
Feb 28, 2013 at 8:13 PM
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