Well it looks like my "Service Engine Soon" (with an error code of: Bank 1 and 2 are lean, at idle) is because of the head work I did. I say this because if the battery is disconnected and I put some race fuel in the tank (1 gal of Xyline) the code does not come back for the whole rest of the tank. Once I fill the tank again and no Xyline the light come back on. Looks like I need to bump up the fuel pressure or have the fuel changed in the chip. Does anyone know if the fuel trim can be changed at idle in the Diablo chip?