Not getting a clue

if you cleaned the MAF sensor with any thing lying a round you may have damaged it , only a special cleaner should be used . I forget the reason for hesitation on hills but forget , keep searching

So, do you think I should perhaps buy a new MAF sensor first and see what happens maybe it was long dead. And another mechanic is also saying that maybe is the valves. My problem is I have already spent a lot of money buying parts and paying mechanics who are unable to tell me as to what is the real issue with this vibration.

Any further comment on the above? I am desperate.