94chb

hi im kinda new to hondas and tuner cars and i have a 94 civic hatch dx that is droping a cylinder when it is cold or hot....(it drops a cylinder when i start it in the morning or after i drive it for about 20 min or both) i checked my timing and its slightly advanced but not to bad and i also checked my distributer and it looks good as well so if anyone knows whats going on and can help it would be greatly appriceated!