We recently heard our F250 powerstroke sputter at startup so we changed the fuel filter. It seemed to fix it, the test drive went fine, no sputtering. Then we heard it sputter the next time we started it and figured maybe its working some air out or something. Well it continues to get worse but it doesnt always do it. It usually does when it starts after sitting a while. It also does it when you decelerate from highway 60-70 mph down to a stop for a light, etc. But on slow neighborhood roads it doesnt do it when you slow to a stop. So there are some times we can expect it to happen but its overall not really consistent about when it sputters. Pressing the gas pedal seems to help work it out some. Do you think its a fuel injector that may be clogged? If so will seafoam be enough to fix it? Could it have been bad diesel thats working itself out? Could it be the air filter? We have an aftermarket air filter that is reusable. Any other advice or help is much appreciated. We want to take it on a trip and are wondering if its something we should fix before driving a long distance. Thanks!