Car is a 2013 Optima sxl 2.0L My main issue is random misfires from all cylinders (thrown as single cylinders at different times) . Got new coils, new plugs, and car idles like its perfectly fine when at operating temperature. I can drive the vehicle like normal with light throttle even up to highway speeds, but the issue starts when i throttle mid to heavily....like merging into traffic or something. Basically just about any time im not feathering the gas pedal, the car will start jerking and throw a misfire code beginning around 2500rpm and up. Im already on my 3rd engine ?♂(long story) with this car and my loan isn't going away anytime soon, my last guess was possibly a sensor (02 or map) but im tired of throwing money into this thing. Just to guess and be wrong again. Now i personally drive very aggressive and the last 'I guess modification ' i did was installed a blow off valve. Car ran fine for a while after constantly stomping on pedal and letting off to hear the bov then outta nowhere the issue began as i was driving highway speeds one night. Any ideas or opinions on what to do would help a mill. I should also add that it does seem like cylinder 2 runs a bit rich and this is the same cylinder that recently had a injector replaced.....thought that was the issue for a good while until, my obd scanner claimed cylinder 4 was misfiring now instead of 2, and live readings gave misfire counts for all cylinders which were slight ......like misfire count: 6-203 of 4k or something .