I need help badly..code 41 detailed as possible

[Passion 4 Speed]

hey guys, i just installed a new head gasket and arp bolts in my car..it ran fined after i put everything back together..couple of hours later my car was very hard to start..once it did, crappy idle, extremly slow revving..no boost whatsoever.
datalogger picked up code 41 injector circuit..so far i checked..
all connections,ecu,and injector harness..

ecu is fine no leaking caps..

all connections are fine expect one..theres a vac hose on the intake manifold right between the fuel injectors (next to spark plugs) .. i dont know where it connects to..(i use to have my boost gauge installed with the fpr hose, after i did the headgasket/bolts job i didnt get any readings from my boost gauge like before?)

the harness on the injectors dont have any metal clips..but it has been like that since i bought the car

the only way i could test the issue was using my datalogger, i got the car started with its crappy idle..tested each injector while running heres what i got

1-2-3 all idles way worse when off..

but the 4th injector when i select it nothing happens same crappy idle
pulled the plug from injector 4 theres a lil bit of wet/dirt inside..cleaned it up with a dry paper towel..still nothing doesnt even start now..
i tried resseting my ecu..same results..
so far im thinking that one injector is shot..is there any other way i could check for trouble shooting? visually checking that one injector??
thanks so much in advance

 

[Passion 4 Speed]

yes i did.
so i pretty much just need new rings?
what do i need to do to get everything done properly and have the car back on the road?
im on a extremly low budget right now..and i do plan on going to school for mechnics..so i might as well take this opprotunity to learn.
is it possible to install the new rings while the block is in the engine bay?
any tips or suggestions is greatly apperciated.

 

[Passion 4 Speed]

ok i pulled the head again and notice a couple of things..
when unbolting the arp bolts, 5 of them came off with the studs..(a couple of days ago i checked to make sure all bolts were on tight with a torque wrench)
the loose studs are from piston #4 all the way across to #1 ..

there arent any bent valves..i alse rotated the camshafts and all the valves open and close properly.

since this car allready been through the whole timing belt broke..smashing valves situation, from the past the pistons has marks on them.

i dunno if this means anything but..piston #'s 1,2,and 3 all wiggle side to side..#2 being the most..4 doesnt budge at all.

everything else seem good. is there anything else i can do to check out why i only have good compression in piston 4