I’ve got a 1988 f250 7.3 idi, N/A. I was coming home one day on about a quarter of a tank and once I got home the truck started to surge and I shut it off. The next day still surging and started to smoke a lot and had what felt like misfiring so I just started pulling the injectors and replaced one after I stripped the threads and then emptied my fuel filter water separator that was replaced a month ago and replaced the fuel filter near the tanks which was filled with broken kind of rusty peices of metal. Still the issue is from idle to 1300rpm the truck vibrates a little and takes more throttle to get through that Rpm range then at about 1500 it smooths out. Good throttle response even from idle.