after i changed the ignition coils the car didn't want to start .it has been drivin yesterday with cylinder 3&4 miss fires thinking changing ignition coils was gonna fix the problem . now it barely even starts jus shaking the car no start i have i didn't install the coils correctly

 

welcome to the forum. Try putting the old ignition coils back on and check your spark plugs.

 

i installed iridium plugs idk if that might be it . i tried putting the old ones back alr . while trying to start it little smoke started forming .checked the plugs they looked fine

 

Where was the smoke?

 

i saw it from the oxygen sensor from the manifold

 

Well, I do not remember if the coils are COP or just a set on distributor.
If you put everything back to original parts then it should go back to original condition
Unless, something else failed???

In any case, back to basics, check the spark with the plug pulled out
Check to see if the injectors have control pulses and see if the fuel pump runs, etc

 

Follow the smoke to the wiring problem. You have a ground attached to a power.