While i was driving my 91 celica gt, i heard a LOUD POP, and the car shook then i put it in a new gear and everything seemed to be working fine. but then after i noticed the acceleration is way off and im positive i have a slipping clutch, the engine hesitates while accelerating, and another thing is i barely replaced the MAP (vacuum)sensor,it was broken while this happened and i had no(on E) gas at the time either. after i replaced the MAP sensor everything was flawless except the acceleration is waay too slow, and the rpm races to the top without even going fast. and another thing is that it( the engine) smells REALLY BAD after EVERY drive, i know it overheats A lot more! . what can be the problem(s)?