Q&A

i just baught the car and the gas gauge and speedomiter started to fail, then i was driving it and i was at a stop and pressed the gas to go forward and it didnt go it started to move very slowly when it finaly was moving at about 20 mph it started to drive ok until i stopped again and i pressed on the gas to go forward and it didnt want to go it finaly started moving slowly but then it died out it would start again until about 20 min later and again it would accelerate i put the peddle to the floor it started to move slow until it got enough speed it started to work ok but when i came to a stop again it did the same thing... can someone help me im not sure what it could be... i took it to a mechanic and he said it was the gas pump but im not sure if he is right...