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

 

Welcome!

 

Welcome to the forum, from half way around the world. If the plugs were gapped properly, is there a lower grade gas you can run over there? 87 octane is the norm over here, and although I'm not familiar with the newer Mustangs, I'd assume they weren't designed to run on 95, but who knows. Especially since you've got some extreme temps over there.

 

well we have 91 and 95 oct over here

 

I'd try the 91, but still doesn't explain the pinging, especially on the 95. Could it have been a bad batch of gas? Your timing is advancing, or your running lean for some reason. Change the fuel filter maybe, and run some good injector cleaner in your tank. Just thinking off the top of my head.