need ALOT of help please car wont start

[nissan2787]

hey guys and girls listen i have a hatchback 91 se. i rebuilt the motor after a blown head gasket now vehicle will not start i replaced almost all of the sensors. no codes on the e.c.u and i know it wont let me know if injectors are bad or knock sensors. i need lots of help any sugg. i will try. p.s my idler sprocket was stripped out of the head and only the head is stripped from what i know the bolt size is m12 x1.25 and this i can get in heli coil but i installed the distributor after this was found out and now it wont start. also when it did run it would only run on 3 cylinders or so it felt and when you unplugged the maf car ran fine but couldnt rev about 2500 rpms b/c of failsafe. i think injector please respond.

[Fahaka]

the mafs is wired incorrectly, or is bad...

[nissan2787]

i tried another used maf and it produced the same issue. could it be that both were bad. if you have any other sugg. please let me now.

[Fahaka]

could be improperly wired. double check it.

[nissan2787]

everything is wired properly still didnt fix the problem!