The traction of the vehicle has dropped. speed is falling on the ramp

I have a saxo 1.4i single door vehicle.

When I bought the car, the new brakes were released from the inspection, the tires were good, we had the engine checked.

smdi 2 thousand km after I received the vehicle

timing belt

oil and oil filter total 10w 40 synthetic semi semi synthetic what oil was put

petrol filter

air filter

I replaced spark plugs and spark plug wires.

After that, when the gasoline in the car was low, it was stopping at the hill, it was singing or something.

I couldn't get my speed in the street of Bagdat Street.

tire burst we put on the spare wheel

Lacquer sounds from ten teams and the steering wheel in a hollow road.

When I shift the gear to 2, when I take my foot off the clutch, there is a voice called Lok.

The car is not wasteful at all.

We went on holiday for 3 thousand km, we came from Istanbul. When approaching the bursa on the way to Bursa, there is a ramp of 2 3 km. The car officially came out like a truck.

When the truck is passing, I don't care what I was doing with the 3rd gear, the 2nd gear.

After taking a break, the car's journey is slightly improved as if the engine gets hot and the car gets a little bit.

Now I do not believe in the masters who say in this car.

I am waiting for a solution from your experiences

thanks

I traveled 400km with 80 pounds of gasoline on the long road

I did not believe the pressure pad, I did not believe the two ..

the problem is on the gas wire