My lil sister bought a 98 Z28 auto with about 95k on it. It seems to run fine but every time I hit it full throttle these codes come up. P0131, P0151, P0137 and P0157. I was done some little changes in the pcm like fan setting and some other little things so I first though maybe I done something. So I flashed it back to stock and these codes still come up at the first wide open run I do. She just bought the car yesterday and drove it 140 miles home and got no codes but she also drove it really easy. I drove it today and if ya don't floor it the codes don't seem to show up.. Some guys on another forum are telling me it's the fuel pump crapping out on the wide open rune but I don't know. Thanks