Gents Im calling on your wisdom again as I have a problem that is driving me absolutely NUTS!!!I will bring you up to date on how my problem started. Recently had some upgraded injectors installed in my F350. When the truck has reached operating temperature the truck runs great, however when the truck is cold such as sitting overnight, and you first crank it if I did not know any better I would say it is hitting on only 6 cylinders. Very rough, and jerky especially when you hit 3rd and 4th is really jerky. But after 10 minutes of driving it runs like a scolded dog??I dont get it, my initial thought was bad injector but would this be the case once it warms and runs great? In a nutshell the truck feels like it is running on 6 cylinders UNTIL it reaches warmer temperature. Once it gets warm it runs flawlessly. I cant let the truck warmup in my driveway 15 minutes before I want to drive it! Anybody have any thoughts on this? I just changed the oil just for grins and it made no difference while it was cold, still bucks and jerks until warm. Going to let the shop have it back to see what they say. Truck throws no codes, and I see no leaks anywhere on the engine. I have 240,000 on the girl but just stumped about this. Thanks Guys! This is the greatest forum out there and Im thankful for all the advice. Maxx

 

Have you checked the glow plugs? you may have a couple bad ones does it smoke at all when you first start it?

You may also have a burnt uvch a bad harness will create the same symptoms your describing miss at cold temp and smooth when at operating temp its amazing how smooth these engines run when down a cylinder at operating temps