2014 Chevy misfire issues

[Marshgoat]

I have a 2014 that has had this problem since new. Random misfires and rough idle. Sometimes after traveling at highway speed and then exiting the interstate it will stumble and nearly die. 3 dealers have checked it and cannot find anything wrong. Go figure !!! The direct injection pump on mine makes the ticking noise 3 times louder than any other 14/15 I have listened to. Asked the dealers to change the pump and I get the same response : No check engine light equals no problem and GM will not let us change it no matter how loud it is. Been a GM customer since 1988 and I think this is my last chevy. The old "Its Normal" and "working as designed" excuses just don't cut it with me. The silenced/muted text notification issue with the 14 models Bluetooth is annoying as %$#@ too !!!