I just bought a 94 civic hb with 108k and I have a problem it almost feels like it is misfiring or bogging out but this only happens at low rpms. I replaced the plugs, wires, cap, rotor, coil I also cleaned the throttle body out. What could this be is there a throttle posotion sensor because it feels like it only happens light throttle at low rpms. It almost feels like I am running out of gas but the tank is full. Any suggestions would be great.