Im having issues with my truck. Ive plugged a reader into it and got no engine codes or egr codes. Runs rough barely idles and most of the time it doesnt. You can smell gas when it runs. Vibrates and shakes. Shuts off when you let off gas.

 

stuck injector, crank sensor issue, cam sensor issue, jumped timing chain, other valvetrain issue.... could be a whole pile of things.