Today under heavy acceleration in 3rd gear the engine began shaking, I shifted to 4th and it stopped, but a flashing CEL Popped up for a few seconds then disappeared. I stopped the car about a half mile down the road after driving easy noticing no further issues. I plugged in my OBDii scanner and no codes popped up. there wasn't anything stored in the freeze frame either. I couldn't tell you the brand of scanner I use off hand, but i have used it before and it does read codes on my car.
I drove the car 40 additional miles (gingerly) today without a hiccup, the idle is as smooth as it gets, there's no knocking or misfire sounds, and I haven't recently fueled up.
I have had a cylinder 4 misfire problem before to solve it I changed the plugs, the coil pack, the MAF sensor, front and rear airflow sensors, swapped the fuel injector, got a tune, took it to two dealerships (and got the run around from both of them), and finally took the car to a specialist who did a valve timing adjustment and solved all the problems.
This hopefully won't be as expensive.
I'm not worried about burning up my CAT because I have none, I just have no idea why a misfire issue (what i suspect is the problem) would not throw a code if the CEL came on.
Anyone have any thoughts on what the issue could be?