I have ran into the same problem Check Engine & Trac Off blinking. I also feel that the car is bugging and like there is not enough power. Also exhaust makes a different noise. Took it to the shop 3rd cylinder not working. It can't be a coil because there would be errors on other cylinders as well. I reset the codes and when I started the car everything was fine nothing came back on and the car was responding perfectly. I also know for the fact it can not be spark plugs because I did a tune up and changed all of them not too long ago.
Last summer i was getting check engine light with O2 sensors. I turned them off and then the engine light would come back on and then few days later it would turn off by itself. Since November I did not had any check engine lights coming back nor did i change my o2 sensors. Now we were getting some heavy rains and this happened. I took the cover checked sparks everything is fine. So do you think the problem is in O2 sensors and the time came to change them? Also my shop told me that O2 sensors go at about 2bills per piece and there is 2 of them that needs to be changed. If anyone changed them are there anybetter prices, if so can you post a link. Thanks in advance!