2017 mustang gt Random misfire

[Cali. Special 17]

17. GT. 5.0 check engine light scan p0300. P0308.
scan tool reads possible causes
Vacuum leak. Low fuel pressure. Bad battery. Just wondering if anyone else has experienced this issue and if so what did they do to correct the problem
Any help would be greatly appreciated

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[ORRadtech]

Is the car stock?
If not, what mods?
What milage and maintenance?
Circumstances when misfires began?

There are just so many possibilities that can cause your symptoms.

The very first thing I would do is to swap the ignition coil on #8 with a cylinder that is not reporting a misfire. I'd also check the plug while the coil is off.

 

[CowboyJohn]

I would first do what is recommended above, you might get lucky.

If not, check out this thread and the links contained in it.

https://www.mustang6g.com/forums/th...-i-want-to-repair-the-intake-manifold.212320/

If you have any questions reach out. So far, the repair I did has held up fine.

 

[IPOGT]

17. GT. 5.0 check engine light scan p0300. P0308.
scan tool reads possible causes
Vacuum leak. Low fuel pressure. Bad battery. Just wondering if anyone else has experienced this issue and if so what did they do to correct the problem
Any help would be greatly appreciated

Correct the easiest one first if the battery is old anyway. Change it…Then rescan and see where you are. A weak battery can jack up sensors.

 

[Cali. Special 17]

Is the car stock?
If not, what mods?
What milage and maintenance?
Circumstances when misfires began?

There are just so many possibilities that can cause your symptoms.

The very first thing I would do is to swap the ignition coil on #8 with a cylinder that is not reporting a misfire. I'd also check the plug while the coil is off.

 

[Cali. Special 17]

Bone stock and always had regular maintenance and I have replaced the plugs like four times in the past couple years with stock motor craft plugs and the last time I did it I replaced the ignition coil's motor craft but I put e3s and each time it would run better of course. Now I did run it out of gas one time and really low a couple times and so I was thinking maybe its the fuel pump and the reason I say that is because I can fill up the check engine light will go out and it will run much better mileage 170.688

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