I recently purchased an 88' Civic DX hatchback. It runs excelent, other than the fact that it pings/knocks under load. Such as when getting onto the freeway or going up hills. I have tried using "premium" gas and have even replaced the plugs, wires, cap and rotor. Retarding the timing all the way does help, but it is still there a bit. Obviously not good to run under full retard all the time, so there has to be a better solution. I appreciate any help. Thanks.
Ryan