ses light on new truck

[sonoma455]

hey whats up i am new i have a ? i have a 2007 new body style sierra with 4.8 and i just put the edge evolution and then put LPP shorty header when i put evolution on i had nice power gain then put the header on and it lost some off the line and then the ses light came on the codes are p0171 and p0174 can you give me some advice thanks

[GasGuzzler]

Those are lean codes. Ditch the Edge and get a real tune. Shorties don't really help much either so if someone will buy both off you then start over.

Make sure there are no vacuum leaks and the fuel pressure is OK.

[mnc2fan]

What he said ^^

Nelson PeformanceNelson performance give them a call after you ditch the tuner, LPP for some lt headers, after you ditch the shorties, yeah actually worth the money for the lpp, no one comes close to price. $500.