Injector?? Maybe??

[powerstroker019]

Truck runs rough when at half throttle... when at fuel throttle seems to run fine. Doesnt idle to rough not enough to really notice.. Doesnt smoke.. just seems to have a miss/cough when at half throttle and steady throttle.. Have replaced the IPR and ICP and that didnt help much... thinking maybe its an injector or oil problem... no check engine light... only mods on the truck is TS chip and intake... Has 260k miles

[LakiPolitis]

I had to replace my IDM because where Ford stuck em (driver side wheel well) wasn't the smartest place. My injectors were all firing at a bit less than they should have been before I installed the new IDM. Bought a re-manufactured one and installed it. Then ran through all the injector tests. Sounds like you may want to get yours diagnosed for an IDM problem. Relatively cheap fix... but that may not be your issue. I noticed I didn't have alot of power in the middle of my power band (1350 - 2500)