P050d help please

[buell438]

I have a 2015 Silverado with 100k and I just recently got the dreaded p050d. I’m getting misfire on cylinder 4 on a freeze frame when code is set. I went thru and ruled out all the simple things, tried new fuel/ cleaner, replaced plugs and wires and swapped coils With no luck. So since I can’t currently afford to have the dealer do the work( let go due to downsizing from covid)and I start a new job Monday my only option is to tackele this myself. My only concern is it seems people are saying there is more than one injector for 5.3 and I don’t want to buy the wrong ones. A low flow vs high flow. And also if I buy all 8 injectors so hopefully I only have to do this once due I still need the sizing tool for the seals. Should I stick to acdelco oem or look aftermarket? It looks like I’ll need new intake gaskets the 2 fuel rails and the injectors. Sorry for the long post but I’m stuck between a rock and a hard place and I don’t want to keep driving my little ones around and risk a break down. Any help is appreciated 

[davester]

I would suggest getting a subscription to the full-service manual for your truck at a site like alldatadiy.com, and work through the diagnostic procedure for that code.