I see there are quite a few people on here with the same issue. Mine will idle fine start fine and until about 1/2 throttle is fine. As soon as you give anything past that it starts cutting out and what seems to me like choking or starving for fuel. I’ve shimmed the valves, new timing chain(timing marks are spot on), new water temp sensor, k&n air filter, does have HMF optimizer that I set back to specs on website when this started happening. I’ve read on other threads about the fuel pump so I ordered one of those. That’s my next step if that doesn’t work what should I do next?