Hello, i have a 1988 dodge w150 power ram. It has a problem with hesitation when accelerated and stalling when stopping. The problem has gotten worse since i got it last year. It now bucks occasionally and will not gain much speed. I have replaced the throttle position sensor, idle control solenoid, fuel filter and the fuel pump. Adjusted the throttle body and the solenoid screw. Also the motor was swapped due to busted seals and high mileage. I'm not sure what the cause of the problem can be, can anyone help?