Hi, i have problems with my cutlass its a 3,1V6 automatic with overdrive, its has a shudder to it while idleing and i lose power during steering and brake, sometimes to the point it stalls on me, i checker all engine fliuds are normal, i have no idea what this is, i also have exhaust coming from the exhaust manifold, heavy octane smell from the engine , my guesses are compression problems or O2 sensors, please help i need to be on the road in a few days