Throttle Body issue, Renault Megane 2011 2.0 CVT

Hello everyone, so for the past week and a half the car would not start at the first push of the start button, it would take 2-3 tries before it would start, then after that it would start working without any issue, even if i turned off the car it would still start fine after.

2 days ago, same thing, but this time was more serious, the car would not start at all.

So...

Some guys came and looked at the car, what they did is that they unplugged a sensor from the throttle body then the car started, after that they turned off the car, plug it back in and .. started again.

Now the engine was running pretty rough, and they said that it has miss fire in all 4 cylinders, I was confused. They said its worth changing the sparkplugs, they quoted me 350 pounds to change them, i was like no thank you.

Now they packed their things and closed up the engine and after they left i noticed they left one of the connectors that connects in the spark plug not plugged in, I hope that was not intentional.

Now today I called a more serious guy that has a lot of reviews.

Same symptoms, car won't start, unplug the sensor, plug it back in, same story, but he did said there is no miss fire issue. He said that he gets good readings from the pedal, but not from the throttle body, he said that the throttle body does get signal but for some reason its still not working ?!

So now I need to find a throttle body but I looked everywhere and I can't find one.

Can someone please guide me on how to find this throttle body? Is that the issue ?

Thanks