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