Fuel injectors acting really weird PLEASE HELP
 

ok so a couple days ago I was trying to figure out what was wrong with my car not being able to idle and it would have very bad lack of acceleration, so assuming it was a fuel issue I unbolted my fuel rail so i could see if the injectors were working properly, and I found out that the injector for #4 cylinder wasnt spitting fuel but #1-3 were. so i changed out the injector and still no solution so i changed my fuel filter (my fuel pump is new btw) and tested my injector plugs with that light you can rent from an autoparts store, all plugs flashed. now last night i thought id check them out again so i did and found out #3 and #4 cylinder injectors weren't firing. checked again today just now and only #4 cylinder injector is spitting.

im so confused on whats going on right now, could this be an ecu issue? please help.

Sounds like an issue with the injector harness or plugs. If the noid light said they were getting signal, Id deloom the harness and inspect. Also if you have a multi meter start checking continuity on those wires too, All the way back to the ecu

just checked the ecu and it throw up codes 12 and 13 which are maf and cts i also jumped each injector and they all work good, about to switch out my maf with another and see if thats actually the issue somehow.

changed out the maf sensor, still nothing. the maf pigtail might be the issue because if i mess with it, it will make the motor run different, the wires look good, im wondering if it's a ground or short somewhere because my cluster lights will flash and my cluster also isnt working properly anymore. anyone have anymore ideas?

#4 and #3 injectors are still not spitting for some reason. #1 and #2 are acting as they should

Fix your MAF. Most likely it's a loose or bad connection at the harness connector. Then mess with the harness at your injectors.

I think it was my sparkplugs so i checked them and there was a whole bunch of nasty shit in there, when i took them out i noticed something in the #1 cilinder where the spark plug goes i thought it was a washer for the sparkplug so i tried to pull it out and when i finally did it was a fucking spring lodged in there so when i went to put my new sparkplugs in i tried to screw in the spark plug for #1 and it wont screw in, so thanks nissan for using a fucking spring as thread for the spark plug to go into, now i have to buy a whole new head.

Its called helicoil...
And prev owner of the engine must have done that.

yeah i feel like an idiot now lol I didnt even think about that being a helicoil for some reason but i have a kit coming in tomorrow. Hopefully the helicoil and new spark plugs will be the end of this nightmare