IDM problem
 

Hello New herehere and let o
Installed remanufactured IDM started fine pressed on throttle and let off it sounded.like half of the injectors quit ,then it smoothed out,going down the highway it does ok except when you let off the throttle same story or slow down to idle. I have all ready sent one module back and they said they sent me a different one.same results
I put my old original in and it and problem goes away! It had a.100 and they sent me a 120 my understanding they are interchangeable. 1996 Ford F259 ps. Any help would be appreciated ps took it to shop no codes.