When i started my car after about 5 seconds of running my SES light comes on with CODE 43: ESC Failure. Then the SES light goes away.....the car runs fine untill it reaches normal operating temperature (after about 10-15 mins) then the tachometer starts to freak out as the car fluctuates from high to very low revs making puff sounds in the exhaust untill the car evenutally stalls (which doesnt take long). When this happens i get CODE 36: Hi-Red Failure an CODE 42: ESC Failure. Now i did replace the Opti about 4,000-5,000 miles ago......but im really hoping thats not the problem. I am very unfamilar with these codes and REALLY need help. Where should i start?? or has anyone experienced this before and might know whats wrong???? any advice would be GREATLY appreciated.

Also, my car is a 6spd