Engine sometimes no pick up while running and engine switch ?

HI tyreguy, sorry if your not able to interfret the problems of my car. but i'll send again about the car problems. 1. the problem is when i push the gas pedal in highway it takes a long time to speed up, same problem at take off when I floor the pedal, accelerate very slow, then runs ok. 2. when i starts the engine it runs but i pressed the gas pedal rpm increase then slowly goes down until engine shutdown. it happens only this to my car when i brought to my mechanic.replaced the fuel pressure due to leaked and cam sensor due to cables worn out. then after 1 week i experienced this to my car. i hope you can interfret my my problems in my car. thanks