Please help 2003 H@ wont start

[350zguy]

First off thank you for any help I can get. I have a 2003 h2 that was runing fine and when I went out to start it a couple of hours later it wont start. H2 cranks and every few cranks is starts but very very rough and if I step on the gas there is no acceleration. I have no replaced the crank sensor and the throttle body, also swapped a computer and still no luck. fuel pressure is good. fuel filter switched out. I am running out of ideas. any help would be great