I know this post is some months ago now but did it cure the problem. Ive got a 2012 trend t200 90bhp, Ive had it since April and ive got a similar misfire. Mines an intermittet misfire, some days worse than others and then other days its fine, sometimes short runs, other times long. No error codes are stored and its doing my head in. Ive replaced the Egr, fuel filter, injectors i was even told it could be a defective exhaust so it had a complete new one. Ive not had the smoke bellowing out yet(probably next) Its cost me a fortune and its still not right. Im hoping someone else may of had the problem and theyve fixed it.