How do u change out a furl injector?

Lets stop replacing things and start checking things how bad does it miss at idle and in general on that cylinder?

Before I changed the plugs, coil it was missing where u could feel it in the driver seat. Now that I changed those items its not as bad.

You should have swapped the coils instead of replacing all. Swap the number 4 injectr with another if you must.

I only changed the #4 coil. Ok So swapping the injector wouldn't hurt anything? And when I do I just buy the O rings?

That wouldnt be a bad idea to replace oring but sometimes its hard to find the correct one in stock. Have reused the orings on them before just inspect them for cracking splittings etc. Also make sure you clean up the area before removing any injectors.

Ok thanks, I'll swap #4 to #6 And see what happens. And when, I do the swap and there's a change they its my #4 injctr was bad?

Or its just clogged.