hello there ! joined this forum recently
i need ur help guys , i<ve got a v6 premium auto mustang 2009
the problem im facing now a days is knocking or hesitation while driving
im facing this issue after changing my spark plugs
i,ve done computer checkup , and it showed that the cylinder 1 misfires
so i changed spark plug wires and coil aswell but still facing the same problem
im using 95 oct petrol and while driving when the car goes to 70 kmh it starts hesitating and the malfunction sign starts blinking and the ac starts blowing hot air :/ for 10 seconds ! and the car is not running smoothly as it used to be
please help

 

The car was working perfectly before you change the spark plugs? And that is all you changed?

 

Swap #1 plug with another and see if the problem moves too.

 

@lordripberger yea car was perfect b4 changing the spark plugs !

 

Go buy a new spark plug.

 

This may sound simple but make sure you have the plug boot pushed on the plug completely. Do that before anything else.