Huey263

2016 Ram 3500 mega cab SRW 6.7 cummins . So I recently completed the EGR and DPF delete. I also installed the Ezlink tuner as well as a S&B cold air intake. Also installed the EGT solution kit that relocates the EGT sensor to cylinder 6 on back of manifold. I had download several tunes and trying them out. I use the truck as a daily driver as well as towing my 43’ fifth wheel. I have a 460 mile drive every Thursday and Sunday. I tried the different tunes along this route looking for best fuel economy. Naturally the 150hp tune gave the best results. All was good for about 2 trips then it started running ruff when I would kick it down and pass cars. It almost felt like a rev limiter. I called GDP up and we ran a data log on it from 0-60mph. While performing the test it ran ruff and we got the P0087 code. The tech also said I was only pulling about 12,400 psi on the rail and it should be about 26,000psi. I know from personally experience if it was only a fuel filter that could usually only account for about 4,000 psi. So I’m not sure what is going on. Could it be a fuel rail sensor, could pressure relief valve be bad( do i need to plug it) is the lift pump clogged up or do I have a fuel pump going bad. Any ideas before I start dumping endless amount of time and money at it.