i have a 97 honda civic coupe i just built a new motor for it the motor is a D16Y7 block with after market dome pistions and the head is a D15B head that has been milled it is around 12.1-13.1 all the plugs are pluged in where they need to i just put new plugs, plug wires, and dizzy i have checked the timing twice it will run and idle good and i can reave it up and it dont cut out but when i try and drive it or get it under a load it starts to back fire and spuder and i dont now what to do next if any one might now what to do or have an idea what to please let me now me or call me at 1 573 544 8589 THANKS....