transmission or plugs problem ? on 1996 Nissan Maxima

My car is just hard to move forward ( still running but vibrated) even I strongly push the gas pedal after I stopped or turned. I hear the vibration ( it seems want to turn the engine off) by the steering wheel. If the transmission problem, how can I check it? If the ignition misfire, do I have to replace all 6 plugs?
thanks

1 answer
Do yo have a Check engine Light on? If so, have the codes retrieved and then trace down those problems. I will help you with the codes once you know them. Please get the numbers like P0301 etc. Let me know and Good Luck!