Problem with Passat V5 150 hp

Hello everyone, first present myself since I am new in this forum.
I tell you the story a bit:
a couple of weeks ago I bought a V Passat of 99 V5 of 150cv, try it and not notice anything weird. As of these two weeks, I notice that the car is not going well, it pulls in short and on the road it costs it to take revolutions. The truth is that I am a bit scared since I do not understand much of mechanics. The car has 102000 km (which I know), and I have the reviews up to 77,000 km from there I don't know anything about it, even if the oil has changed.
I would like to advise me, which is what can happen to you or what you have and what to do.

Greetings to all and I wait for your answer.

Look when acquiring a second -hand vehicle, the first thing is a complete refinement, change of spark plugs, spark plug wires, air and changeable filter, these last two are the main culprits of the pulls, try this is not expensive and you can do it yourself, it is everything I can tell you due to the few data you give me.

Thank you very much, I will look at the spark plugs and filters. The truth is that I have no idea of ​​a mechanic, you could tell me where I can get a guide on how to change filters and spark plugs.

All the best

Well, look for the vehicle manual if you do not get it, take a photo of the engine and send it, I point to you where they go, you need a couple of tools, if you prefer what you send you will not charge you so expensive, in the same way you will have to buy tools,

I send you some images if you can help me. I have been looking at the mechanic manual of this website and it is very generic almost not speaks anything about V5, will you not know where to get a more specific V5 of 99?