Any gm mechanics out there?please help need the firing order on a 1993 buick lesabre 3,8!i need my car!?

hey gm mecanics i have been trying for the last days trying to get my car to run right people keep giving me the wrong firing order the recent one i just tried is he car is trembally like craxy it like shakes the whole car and the exaust thats the recent firing order someone gave me and the car sounds horrible!please help the one i tried when this happened is the front was 135 the back was 246 i dont know whts going on people keep giving me the wrong firing order and i dont know what to do please hlp!i need my car right now!