I have a 93' loyale and have been told by 3 garages that the cadalytic converters are bad but I just disconnected my exhaust and it still bucks and lugs. I just tuned it up new plugs wires and cap (rotor set screw was stripped so I coudln't get it out) thinking that it might solve the lugging but it didn't . Anyone have any experience?

timing could be off. could be bad gas.. any other symptoms? how long has it been doing it? did you change anything before the problem started?

Your fuel filter could be plugged up or even worse a bad fuel injector.