My 2014 v6 mustang is currently having misfires in piston 4 5 6. It's gotten so bad that the car does not accelerate anymore, shook bad and knocked a bit. I changed out the spark plugs, ignition coils and still have no idea what is going on. Anyone know what my next step could be. Right now I have it started but will not go into drive, everyone it does go into drive it will stall out.

 

Maybe there's something wrong with the injectors on that side. Check to see that they're electrically connected correctly. Maybe, if you can, swap them from one side to the other to see if the problem follows the injectors or stays on that side.

And then... to the dealer with you so their scan tool can help figure it out, probably.

Although... maybe you need to see if there's any codes? Check engine may or may not light but there may be codes anyway.