Poating for my dads truck. Its a 04 lb7 215k miles he did all injectors a few weeks ago. He says truck is running rough last few days and has a p1238 code. I cant seem to find much of anything on this code. He will be changing the fuel filter tomorrow. Is there anything else he should look at to help diagnose what the issue could be? Has been running fine since injectors except last couple days.
Truck is stock with just a ppe boost valve
Truck is stock with just a ppe boost valve