P0300 CEL 2017 Mustang GT

[jakebeauchampp]

I’ve changed spark plugs, vacuum tested, fresh upgraded injectors, car has 18+ manifold with imrc’s locked out. (No tuning error). Car has no cats and long tube headers. Cel p0300 comes and goes and it will never direct me to a certain cylinder. I used forscan and saw that all the cylinders were misfiring. I’ve even tested the coils and they were fine from boot to spark plug but i haven’t checked the readings from the coil plug connector.
Fresh crank shaft position sensor and even tested cam shaft position sensors!
I’m stuck and Would like if someone can point me in the right direction!

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[SheepDog]

What does your fuel pressure look like? Misfires on all cylinders could be from low fuel pressure, or fuel delivery issues.

 

[jakebeauchampp]

What does your fuel pressure look like? Misfires on all cylinders could be from low fuel pressure, or fuel delivery issues.

I have fuel pressure gauges, everything seems to be working correctly!

 

[krazer]

did you ever resolve this?

 

[DougS550]

I have fuel pressure gauges, everything seems to be working correctly!

When does the fault happen? When idling, cruising or WOT? If you only get the P0300 code, and all cylinder are faulted, its most certainly not spark plugs, coils, injectors, Oxygen sensors causing lean AFR, EGR valve, Tank Pump, HP DI pump (if your car is gen 3) but first, answer my first question to move forward.

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