just wondering in everyones opinion is what i have in my car right now is the right stuff to have....

97 LS motor with a p75 ecu and a ls/b20 wiring harness....

i just want to know cuz my car isnt starting at all...it cranks over, gets fuel/spark/air...but doesnt want to completely start.

the harness i have on the LS came off of the b20 i had before....just wondering if maybe i should just buy a new harness and if so, what one am i looking for?