Help with A3 1.8t

Good night to all, I am amazed at that of experts on this type of websites, spend many hours reading and I don't stop learning, and I have finally decided to write.
First of all I present my car and its history, then I will tell you the problems that I have, (that I am sure you can help me, since every time I did less of the mechanical workshops and more of me with the help of experts like you). And finally some of my questions that are not few. I have separated it in parts for those who do not want or time to read the history of my car and go directly to the question of the matter.
History of my car:
It is an A3 8L 1.8T 150CV. AGU motor; I bought it the owner of a scrapping for a decent price, but you can imagine how disrupted it has been.
At first I was going well until I founded the engine because of my inexperience and bad head. The question, the engine changed, and since there it has never finished doing well. I change it a mechanic that has no idea and it seems incredible to keep having the workshop with the way of working. (Of course I did not know)
after 1 and a half of changing the engine, I pick up and break the collector and a piece of the admission butterfly where the gas cable is touched, among other parts. They hung it and supposedly fixed the pieces, the same inexperienced mechanic that amount to it since I was in motor guarantee, and I did not want to pay another for an error of this.
I have started using vag-com for recently and I am still studying the functioning of this and its codes.
OKS said that, I know that it is not necessary to explain all this rollazo but to give the novel a little more excitement, and give you all possible data, I have told it.
We go with the symptoms of the car and vag-com's breakdown codes that I have.

Symptoms of the car:
- Recruiti very unstable, it makes whispers when braking, in a traffic light for example even the engine sometimes.
- Excessive consumption, I have come to have 30l/100km on average, something exaggerated.
- Does not throw as it should.

Vag-com Averia codes:
This diagnosis is from this morning with the engine stopped and cold.


Vag
-Comment: Release 311.2
-
N
CONTROL
MODULE
PART P1559 - 35-00 - -
16486 - Mass Air Flow Sensor (G70): Signal Too Low
P0102 - 35-10 - - - Intermittent
16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit
P0130 - 35-10 - - - Intermittent

and this yesterday with the engine stopped but hot, I put it because I put it out because I put it out because I put it out because I put it out because I put it out because I put it out, I put it in the engine.
Vag -Comment Version


:

Release

311.2
-N
Control MODURE PART - Intermittent 17967 - Throttle Valve Control Part (J338): Fault in Basic Settings
P1559 - 35-00 - -
16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit
P0130 - 35-10 - - - Intermittent
17967 - Throttle Valve Control Part (J338): Fault in Basic Settings
P1559 - 35-10 - - - Intermittent

I have also made diagnosis with the engine on, but I don't know what is the perfect way to do so, I have left the same errors in both cases.
Also tell you that the last problems I have had are:
- The engine failed, trembled and towards exhaust explosions, had a pipette of a broken coil, changed it. I don't think it has anything to do with the mistakes I have now, but I explain everything.
- I had a broken admission sleeve, I changed it. It could be perfectly the cause of the basic adjustment of the butterfly, right?

- It does not let me make the basic adjustment of the butterfly, it gives me error. Could it be because of the plastic that holds the gas cable in the butterfly, which is broken and endures with a small flange? I have been like this for a long time and it hasn't given me problems.



Questions:
- What is the right way to make the diagnosis? With the hot, cold, ignition or stop engine?
- Why doesn't it let me make the basic adjustment of the butterfly? Is there any other way of doing it?
- Could it be the caudalimetro, the cause of consuming so much? Or the basic adjustment of the butterfly?
- How could the flow and the EGR test?
- All the symptoms of the car could be for these failures in sensors?
- They should be the sensors or could it be that cleaning the connections with waste?
- What would you do if you were in my case? Order in checks and procedures?
- With version 311.2 Can I do all the functions with my car?
Please help, I am a boy eager to learn, free time and without money.
I hope I haven't bored you much with all this post rollazo. Hehe
thank you very much in advance, I am sure we will make my little one fed.
PS: I attach a capture of the error when I make the basic adjustment, the sleeve that is broken and the butterfly with the flange (although n is very appreciated)
greetings and thanks.

I will try to answer you with the little that I know by the technical one in a/c
first question = the diagnosis at normal temperature or half of the temperature meter.
2a = the Scaner is not very good or the TPS is not electronic (when you step on the accelerator, move a chicote to aselera)
3rd: it could be or have false air taking and the reading is incorrect

4a:
with multimeter ul and EGR if you already read, megabit says it goes down a packaging without holes without holes already synthes 6th: It would be to guess
7a: I would first go from the most complicated centery for example, for example, false air shots.
8a: No idea