The number 4 lifter is making noise and the number 3 and 4 cylinders are misfiring. The transmission is hard shifting and sounds like it is coming out of the truck with a hard bang. I have less power. I have changed the plugs, checked all of the coils and added fuel injector cleaner to the gas tank. Nothing has worked. I have had mechanics check it out and they do not have a solution, other than spending as much as 2000 dollars to switch out parts. They say that it the afm system f** it up.

This makes the 4th time in 8 months the same injector has failed and had to be replaced.