I have some error codes that i need help with. I have a 1997 Z-28 W/ hypertech grantellie and K&N box. I'am getting P0171 P0174 and P0507 error codes. Is it EGR TPS or AIC. Any help would be appericated
Thanks Larry

 

171 is lean on bank 1, 174 is lean on bank 2 and 507 is idle system high, IAC is responding. One common denominator to all 3 is a vacuum leak.