Sup yall. My car has been running funny the last couple months. It seems like it's runnin on 3 cylinders. I know somethings wrong cuz my exhaust all of a sudden got hella quiet too. Like almost half as loud as it used to be. When I hit the gas on the freeway yesterday, the car puttered and never did it again. I already changed the fuel filter, cap n rotor, sparkplugs, map sensor and had a recent tune up. I have a Fields v-tec controller in it and a accel ignition coil. Could it be one of those causing the problem? Ooh yah, my tachometer needle jumps all over the place when i tach it over 4.