Got a 90 Accord, stock motor, free flowing intake, everything else in the motor stock. Valve rattle when maintaining speed. During decel or accel, no rattle, if I let off gas a little to coast, valves rattle like crazy. What are the posibilities? I replaced the valve cover gasket & related sparky gaskets because I was leaking oil like mad. Oil leak gone, valves now rattle. Help! This is my first Honda.