I have a 2012 37x I been having a problem with cylinder #3 I put all new plugs in a new coil new injections and I'm still getting this code when I'm driving its ok but when I accelerate it misfire I'm lost on what to do next HELP

 

Did you swap the coil from #3 and #4? If so did the issue remain with #3?

 

since you already stated you have put in all new plugs, a new coil, and new injector, is it safe to assume you got the correct spark plugs with the correct gap? factory oem ignition coil and oem fuel injector?

second step is to check all your electrical harness wiring for cylinder 3. check the connector and wiring for the coil and fuel injector for pinches or perhaps rodent damage. if your wiring is good then you have to check if the engine is mechanically sound.
check engine compression in your cylinders and do a cylinder leakdown test and compare the faulty cylinder to all your other cylinders.