I have a cat less dp hard pipes and cai the previous owner stated that it is on a "gas saver" tune, I have replaced the evap purge valve but still have the p0451 code and the other one I'm thinking is the tune maybe it's just to fat. Any help or advice would be greatly apreciated
P2178 fuel trim rich at cruise or accel
P0451 Tank pressure sensor condition

 

wat was the fix for the p0451 if u remember