No turbos on 6.9s. Not factory anyway.
The fuel could be spraying up and into the throttle body. The fuel solenoid only stops the fuel from reaching the injectors. If fuel goes down the throttle body, it can still start and run. I have done it many times when I have fail-to-start.
Put the air filter and lid back on and try it again. If the engine still starts and runs, your fuel solenoid is stuck open.
If your 250 a 4X4? Mine is an 86. Rusty and trusty! No exhaust (well at least it is not ON the truck yet
), so I make bit of noise when at 2500 rpm.
At low rpm, it is mild as a kitten.
You do know not to use ether right? Ether will take out you glow plugs. Use WD40.
PM me if you want. I'll help all I can.
68C15 -- Not a stroke. It's a binder.