As the title says my block learn and fuel intrigrator is 160. So my car is running lean. But my gas milage is 13-15 in the city. The engine was swaped to a 350. The only code I have is a code 54 and I already know my fuel pump relay is bad and I will be replacing it soon. I don't know if I have the right injectors either. I think they are the stock injectors from the 305. I also have a jet performance chip ( Its only a temp fix until I burn a new prom) I had bought it from a friend for $50. My exhaust manifolds are leaking and my cat is starting to get restricted because all the emission controls have been removed. I know all these things can conribute to a lean condition but then why is my gas miliage fine? And I thought there was a lean condition code too. I am puzzled about why this code has not tripped yet because the computer has hit its limit of correcting fuel trim.