Truth be told, the sunny is usually driven by my dad and gets maintained by nissan islamabad. I just went ahead and did the things that were the easiest to solve the problem I experienced when I took the car out 2 days ago. Its was shuddering whenever I slowed down and would usually stall if I stopped in D. I had to shift into N, press the brake while simultaneously pressing light on the throttle to keep the rev's from dropping under 500 before coming to a halt in traffic. I keep a record of my own cars but usually work around my dad's cars too so most of the time, I am not aware of when what was changed. The findings were kinda worrying when I started taking things apart.
Took out the plugs to find them shot. Got a new set, cleaned the chambers and made sure everything was nice and tight.

The chambers did not look so clean to me so I had to clean them too making sure nothing went down there.

The throttle body was BLACK. I emptied a full 300ml of carb stray to get it looking like this. Also unlike my vitz, removing the tb was a hassle with the throttle wire attached to it and I just didn't want to take off everything so I had to clean it on the car which meant I had to walk around the front of the car to get a better angle, holding the tb in one hand while cleaning the front and back with the other.

The IACV was clean and not jammed, though the two screws holding it had absolutely jammed up. Had to use mega force to get them opened. The MAF sensor was a little dirty, had some fibers stuck in there. I gave it one quick spurt of maf sensor cleaner and let it air dry.

I put back everything, started the car. No check lights, put the car in D while the parking brake and brake were engaged, the rpm stayed stable at 700, no shudders.
Also, I replaced the air filter. Saw these two wires down there. Are these meant to go somewhere?

Thanks all for the help.