My Nissan engine is vibrating, when i press the gas it makes a loud noise.

What is your question?

Bought a car from my friend just so i can get from point A to point B. Its a Nissan altima 1994 gxe, when i am driving my engine looks like its vibrating and makes a loud noise,it comes and goes,for the first time i checked the oil and it was high so i drain a bit, i think it blew the spark plugs not sure,i think its also burning oil. could it be a gasket? or my car computer?