New engine wont start

sup nissans :A

first of all… i have a 1989 nissan pulsar NX… and i blew my motor earlier dis year before summer…

i had a new motor put in… CA18… and it barely made it out of the shop at first… but after it ran ok for two weeks…(at this point my fuel pump was weak… and mechanic said “gotta change cpu”)… but it ran… so i left…

two weeks later… car does not start like it used to… it starts every several hours… 5-10 hours… after i turn off the engine (if i ever get a chance to turn it on…:mad: )

it sat… for a bout a month… and i thought fuel was low… i put more fuel… which wasnt much probably… 7litres… and it was over flowing… car did start… so i took it the mechanic…

i had the fuel pump changed… and now it doesnt start…

forgot to add… before the car i left the shop… the fuel injectors that came with the engine wasnt “working properly”… so i used the fuel injectors from the engine that i blew in it… and it ran for those two weeks until it messed up… :mad: … so today i put in back the fuel injectors that came with the engine and now it doesnt start at all…

cant seem to find the problem but my mechanic says its “cpu”… but i put enough money into it… as im working part time… and its a pain the ass that i gotta change so many things that probably doesnt need to be…

pretty long yeah… sorry … thanks in advanced for ur help…

Patrick