i have been having trouble with my 1990 buick century wagon the was running

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rough i thought it was the fuel put in additive it didnt work i had my mechanic look at it he changed the fuel pump the crank position sensor the module and the fuel filter cleaned out the throttle body i picked up the drove it home the whole time it had a low idle drove it with two feet to keep it running arrived home shut the car stasrted it later on and back to the same problemm car starts and runs rough step on the accelerator and the car stalls was told to change the fuel regulator the car ran rough shut it down started it again and it ran strong took it for a test drive car ran great shut it down thinking i solved the problem started it again lator on and thw same problem riugh running cutting off when you use the accelerator i posted these problems on this site and was told to disconnect the maf sensor it worked car responded to the gas pedal and the hand throttlling i changed the maf sensor and the car ran great good idle responsive took it for a test drive about a quarter mile into the ride the motor starts to break up unresponsive to ythe peddle came home shut it off came back out an hour lator the car started right up took it for a ride car ran good responsive strong came home shut it off started it again and the same problem car is running rough step on the gas and it stalls i cant seem to figure out the problem any help would be greatly appreciated no codes and no check engine lite thanks