1997 Chevy Truck P1351 and P0302: Hard start, Hesitation, S

Hi Docfixit, I put back the old original ICM (because I think it still good, I replaced it by guessing with the one from Autozone) and it clear P1351 (hope it don't come back), clear the code, drive around a block couple time, then scan again, I still have P0302, I though I replace # 2 Injector it should take care of P0302? But it not. So I might still have problem with # 2 cyl? But if it missing only # 2 it should not be that bad, at idle it misfire, (seem like more then 1 cyl) then smooth out at high rpm, it hard start in the morning, take 3, 4 time before it start, when driving, step on gas it stumbles, stutter, then at around 10 to 20 mph it shoots up to 30 to 40 mph. Almost as if something was stuck in the airflow or something was restricting the system?

Yes, clean MAF did help with start up, it start right up. But compression good, still get P0302? And at idle it misfire, (seem like more then 1 cyl), when driving, step on gas it stumbles, stutter?

Hi Docfixit, I still working on my truck on the weekend and still have problem. I currently have code P0300 and don't known what it could be, since P0300 not clear or point to any component? Still rough idle, hesitation, stumble when step on gas from 15 to 25 mph, get better from 25 to 70 mph but still can feel little misfire. What else can I try? Please help.

Hi Docfixit, the fuel pressure is 52 psi and step on the pedal it jump to 57, is that low is nough to cause code P0300, rough idle, hesitation, stumble when step on gas? Is fuel pump bad?