doodski

hi need help. in order for my car to start is that yopu have to crank it twice sometimes 3 times before it start. sometimes if you slow down you have to step on the gas so it wont die. i brought it to 3 different garages. first they change the plugs, wires and injectors. first two weeks it work fine after that its back to the same problem. second garage change the overload relay and some toher relay. still didnt solve the problem. the third one change the airflow meter, samething. i dont want to waste anymore money. any suggestions would be appreciated. is it common for w124 model for this kind of problem. thanks.