I would pull the plugs. label them from what cylinder they came from and look at them to see how they are burning..the plugs should look whitish in color.
if you see fouling you can do a compression test on any suspected cylinders. if all checks out with plug reading get a spark plug tester. one by one check
your spark. (If you can pull the stored codes to help you in your diagnostic.) If spark checks out.fuel pressure is next. then fuel injector test. Eric has a good
video on this..good luck and keep us posted.
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